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		<h1>Học tốt Vật lí 11 bài 24&#x3A; Suất điện động cảm ứng</h1>
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			Học tốt Vật lí 11 bài 24: Suất điện động cảm ứng
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			<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>A/ Kiến thức cơ bản</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>1. Suất điện động cảm ứng trong mạch kín:</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Là suất điện động sinh ra dòng diện cảm ứng Ф trong mạch kín.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>2. Định luật Fa-ra-đây:</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Độ lớn của suất điện động cảm ứng xuất hiện trong mạch kín tỉ lệ với tốc độ biến thiên từ thông qua mạch kín đó.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">|e<sub>c</sub>| = </span></span></span><img alt="" height="37" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-1.png" width="31" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span></span></span></span><br  />
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<strong><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">B/&nbsp;</span></span></span>TRẢ LỜI CÂU HỎI C1, C2, C3 SGK VẬT LÝ 11 BÀI 24</strong><br  />
<strong><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">C1. a) Nhắc lại định nghĩa suất điện động của một nguồn điện.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">b) Trong các sơ đồ mạch điện, nguồn điện lí tưởng một chiều được kí hiệu như hình a. Ngoài ra, nguồn điện còn được kí hiệu như hình b, trong đó, điểm ngọn của mũi tên chỉ vào cực dương của nguồn; chiều mũi tên được gọi là chiều của suất điện động. Tính U<sub>AB</sub> theo sơ đồ c.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">c) Tính U<sub>CD</sub> theo sơ đồ hình 24.1d SGK.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">d) Tính U<sub>AB</sub> theo sơ đồ hình 24.1e SGK với một nguồn có r ≠ 0.</span></span></span></strong><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><strong>e) Nhắc lại biểu thức của điện năng do một nguồn điện sản ra trong một khoảng thời gian Δt.</strong><br  />
<img alt="Giai vat ly lop 11 bai 24 cau c1" height="271" src="https://sachgiai.com/uploads/news/2019_08/giai-vat-ly-lop-11-bai-24-cau-c1.jpg" width="500" /></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i><u>Giải:</u></i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">a) Định nghĩa suất điện động của một nguồn điện:</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Là đại lượng đặc trưng cho khả năng thực hiện công của nguồn điện và được đo bằng thương số giữa công A của lực lạ thực hiện khi dịch chuyển một điện tích dương q ngược chiều điện trường và độ lớn của điện tích q đó.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">b) Tính U<sub>AB</sub></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><img alt="Giai vat ly lop 11 bai 24 cau c1b" height="55" src="https://sachgiai.com/uploads/news/2019_08/giai-vat-ly-lop-11-bai-24-cau-c1b.jpg" width="155" /><br  />
Trong sơ đồ hình 24.1c&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">r<sub>i</sub> = <b><span style="font-family:&#039;Kunstler Script&#039;">E</span></b> - U<sub>AB&nbsp;&nbsp;&nbsp; </sub></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">=&gt; 0 = <b><span style="font-family:&#039;Kunstler Script&#039;">E</span></b> - U<sub>AB&nbsp;&nbsp;&nbsp; </sub>(r = 0)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">=&gt; U<sub>AB</sub> = <b><span style="font-family:&#039;Kunstler Script&#039;">E</span></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">c) Trong sơ đồ hình 24.1d<br  />
<img alt="Giai vat ly lop 11 bai 24 cau c1c" height="74" src="https://sachgiai.com/uploads/news/2019_08/giai-vat-ly-lop-11-bai-24-cau-c1c.jpg" width="159" /></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">ri = <b><span style="font-family:&#039;Kunstler Script&#039;">E</span></b> – U<sub>DC&nbsp;&nbsp;&nbsp; </sub></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">=&gt; 0 = <b><span style="font-family:&#039;Kunstler Script&#039;">E</span></b> – U<sub>DC&nbsp;&nbsp;&nbsp; </sub>(r = 0)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">=&gt; </span></span></span><img alt="" height="48" src="https://sachgiai.com/uploads/news/2019_07/image-20190731181537-4.png" width="97" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:14.5pt"> </span></span></span></span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">d)&nbsp;<img alt="Giai vat ly lop 11 bai 24 cau c1d" height="57" src="https://sachgiai.com/uploads/news/2019_08/giai-vat-ly-lop-11-bai-24-cau-c1d.jpg" width="160" /><br  />
ri = </span></span></span><img alt="" height="40" src="https://sachgiai.com/uploads/news/2019_07/image-20190731181537-6.png" width="51" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span><sub>&nbsp;&nbsp;&nbsp; </sub></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">=&gt; 0 = <b><span style="font-family:&#039;Kunstler Script&#039;">E</span></b> – U<sub>AB&nbsp;&nbsp;&nbsp; </sub>(r = 0)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">=&gt; U<sub>AB</sub>= <b><span style="font-family:&#039;Kunstler Script&#039;">E</span></b> &nbsp;- r.i</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">e) Điện năng do một nguồn điện sản ra trong một khoảng thời gian Δt.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">A = <b><span style="font-family:&#039;Kunstler Script&#039;">E</span></b>.I.∆t</span></span></span><br  />
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<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>C2. Nghiệm lại rằng, trong công thức |e<sub>c</sub>|= </b></span></span></span><img alt="" height="37" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-1.png" width="31" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i><u>Giải:</u></i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Trong công thức: |e<sub>c</sub>|=</span></span></span><img alt="" height="37" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-2.png" width="31" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Đơn vị của |e<sub>c</sub>| là Vôn (V)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Đơn vị của </span></span></span><img alt="" height="37" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-3.png" width="31" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt">&nbsp;l</span></span></span></span></span>à </span></span></span><img alt="" height="37" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-4.png" width="40" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.5pt"> </span></span></span></span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Ta có: I =&nbsp;</span></span></span><img alt="" height="33" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-5.png" width="8" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>=&gt; (1Ampe)1A = </span></span></span><img alt="" height="35" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-6.png" width="9" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Và F = q.e =&gt; (1Niutơn) 1N = </span></span></span><img alt="" height="35" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-7.png" width="28" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">* B = </span></span></span><img alt="" height="35" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-8.png" width="45" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>&nbsp;=&gt; (1Tesla) 1T = </span></span></span><img alt="" height="35" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-9.png" width="24" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>&nbsp;= </span></span></span><img alt="" height="44" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-10.png" width="38" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:16.5pt"> </span></span></span></span></span>&nbsp;= </span></span></span><img alt="" height="35" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-11.png" width="20" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>&nbsp;</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">* Ф = B.S.cosα =&gt; (1Vebe) 1Wb =T.m<sup>2</sup></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">=&gt; </span></span></span><img alt="" height="35" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-12.png" width="29" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>&nbsp;= </span></span></span><img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-13.png" width="31" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>&nbsp;= </span></span></span><img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-14.png" width="41" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>&nbsp;= V</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Vậy đơn vị của </span></span></span><img alt="" height="37" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-15.png" width="31" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>là</span><i>&nbsp;</i></span></span><img alt="" height="37" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-16.png" width="33" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>&nbsp;hay Vôn (V).</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>C.3. Xác định chiều của suất điện động cảm ứng xuất hiện trong mạch kín (C) trên hình 24.2 khi nam châm:</b></span></span></span><br  />
<img alt="Giai vat ly lop 11 bai 24 cau c3" height="228" src="https://sachgiai.com/uploads/news/2019_08/giai-vat-ly-lop-11-bai-24-cau-c3.jpg" width="200" /><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>a) Đi xuống.</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>b) Đi lên.</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i><u>Giải:<br  />
<img alt="Giai vat ly lop 11 bai 24 cau c3a" height="205" src="https://sachgiai.com/uploads/news/2019_08/giai-vat-ly-lop-11-bai-24-cau-c3a.jpg" width="300" /></u></i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">- Trong hình 24.2a, nam châm đi xuống, tăng, chiều của suất điện động cảm ứng (chiều của dòng điện câm ứng) ngược chiều của mạch.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">- Trong hình 24.2b, nam châm đi lên, Ф giảm, chiều của dòng điện cảm ứng cùng chiều của mạch.</span></span></span><br  />
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<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">C/&nbsp;</span></span></span><strong>TRẢ LỜI CÂU HỎI VÀ BÀI TẬP&nbsp;SGK VẬT LÝ 11 BÀI 24&nbsp;TRANG 152</strong><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>1. Phát biểu các định nghĩa:</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>- Suất điện động cảm ứng;</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>- Tốc độ biến thiên từ thông.</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i><u>Trả lời:</u></i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Phát biểu các định nghĩa:</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">- Suất điện động cảm ứng: là suất điện động sinh ra dòng điện cảm ứng trong mạch kín.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">- Tốc độ biến thiên từ thông:</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Độ lớn của suất điện động cảm ứng xuất hiện trong mạch kín tỉ lệ với tốc độ biến thiên từ thông qua mạch kín đó</span></span></span><br  />
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<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>2. Nêu ít nhất ba ứng dụng của hiện tượng cảm ứng điện từ.</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i><u>Trả lời:</u></i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Ứng dụng của hiện tượng cảm ứng điện từ:</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Trong máy phát điện để tạo ra dòng điện xoay chiều.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Trong máy biến thế để biến đổi hiệu điện thế của dòng điện xoay chiều.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Trong các động cơ điện.</span></span></span><br  />
<br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>3. Phát biểu nào dưới đây là đúng?</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Khi một mặt kín phẳng, quay xung quanh một trục nằm trong mặt phẳng chứa mạch trong một từ trường, thì suất điện động cảm ứng đổi chiều 1 lần trong</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">A. Một vòng quay.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">B. 2 vòng quay.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">C. </span></span></span><img alt="" height="35" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-17.png" width="8" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>&nbsp;vòng quay.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">D. </span></span></span><img alt="" height="35" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-18.png" width="8" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>&nbsp;vòng quay.</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i><u>Trả lời:</u></i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Đáp án: C</span></span></span><br  />
<br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>4. Một mạch kín hình vuông cạnh 10cm, đặt vuông góc với một từ trường đều có độ lớn thay đổi theo thời gian. Tính tốc độ biến thiên của từ trường, biết cường độ dòng điện cảm ứng i = 2A và điện trở của mạch r = 5Ω.</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i><u>Trả lời:</u></i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Suất điện động cảm ứng</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">|e<sub>c</sub>|=</span></span></span><img alt="" height="37" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-19.png" width="31" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>=</span></span></span><img alt="" height="37" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-20.png" width="37" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>= r.i</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Tốc độ biến thiên của từ trường</span></span></span><br  />
<img alt="" height="37" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-21.png" width="29" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>=</span></span></span><img alt="" height="37" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-22.png" width="24" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>= </span></span></span><img alt="" height="37" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-23.png" width="26" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:11.5pt"> </span></span></span></span></span>&nbsp;= 10<sup>3</sup> (T/s)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>5. Một khung dây dẫn hình vuông cạnh a =10cm, đặt cố định trong một từ trường đều có vectơ cảm ứng từ vectơ </b></span></span></span><img alt="" height="28" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-24.png" width="13" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:5.5pt"> </span></span></span></span></span><b>&nbsp;vuông góc với mặt khung. Trong khoảng thời gian Δt = 0,05s; cho độ lớn của </b></span></span></span><img alt="" height="28" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-25.png" width="13" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:5.5pt"> </span></span></span></span></span><b>tăng từ 0 đến 0,5T. Xác định độ lớn của suất điện động cảm ứng xuất hiện trong khung.</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i><u>Trả lời:</u></i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Suất điện động cảm ứng</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">|e<sub>c</sub>| =&nbsp;</span></span></span><img alt="" height="37" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-26.png" width="31" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>=</span></span></span><img alt="" height="37" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-27.png" width="37" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>=&nbsp;</span></span></span><img alt="" height="38" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-28.png" width="85" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:11.5pt"> </span></span></span></span></span>&nbsp;= 0,1 (V)</span></span></span><br  />
<br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>6. Một mạch kín tròn (C) bán kính R, đặt trong từ trường đều, trong đó vectơ cảm ứng từ B lúc đầu có hướng song song với mặt phẳng chứa (C) (hình 24.4). Cho (C) quay đều xung quanh trục Δ cố định đi qua tâm của (C) và nằm trong mặt phẳng chứa (C); tốc độ quay là ω không đổi.<br  />
<img alt="Giai vat ly lop 11 bai 24 cau 6" height="228" src="https://sachgiai.com/uploads/news/2019_08/giai-vat-ly-lop-11-bai-24-cau-6.jpg" width="200" /></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>Xác định suất điện động cảm ứng cực đại xuất hiện trong (C).</b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><i><u>Giải:</u></i></b></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Lúc ban đầu </span></span></span><img alt="" height="25" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-29.png" width="11" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:5.5pt"> </span></span></span></span></span>&nbsp;và </span></span></span><img alt="" height="28" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-30.png" width="13" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:5.5pt"> </span></span></span></span></span>&nbsp;hợp với nhau một góc </span></span></span><img alt="" height="33" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-31.png" width="9" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Nên góc quay α = ωt + </span></span></span><img alt="" height="33" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-32.png" width="9" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>&nbsp;=&gt; Ф = B.S.cos(ωt + </span></span></span><img alt="" height="33" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-33.png" width="9" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Suất điện động cảm ứng</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">|e<sub>c</sub>|= -<i><span style="font-family:&#039;Cambria Math&#039;,&#039;serif&#039;">&nbsp;</span></i></span></span></span><img alt="" height="35" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-34.png" width="23" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>= -<i><span style="font-family:&#039;Cambria Math&#039;,&#039;serif&#039;">&nbsp;</span></i></span></span></span><img alt="" height="35" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-35.png" width="23" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>= B.Sω.sin(ωt+ </span></span></span><img alt="" height="33" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-36.png" width="9" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">Vậy e<sub>c max</sub>= B.S.ω&nbsp;&nbsp; (Lúc đó:sin (ωt + </span></span></span><img alt="" height="33" src="https://sachgiai.com/uploads/news/2019_08/image-20190802150943-37.png" width="9" /><span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:14.0pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,&#039;serif&#039;"><span style="position:relative"><span style="top:10.0pt"> </span></span></span></span></span>) =1)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif">e<sub>c max</sub>=B(πR<sup>2</sup>)ω</span></span></span>
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