Lecture 14 with notes

Lecture 14 with notes - Lecture 14 March 4, 2010 Chapter 30...

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Lecture 14 March 4, 2010 Chapter 30 Induction and Inductance II
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- Faraday’s law of induction - Lenz’s rule - Electric field induced by a changing magnetic field - Inductance and mutual inductance - RL circuits - Energy stored in a magnetic field (30 – 1) Outline
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A loop of wire lies in the plane of the page. An increasing magnetic feld is directed out oF the page. The induced current in the loop is: 1 2 3 4 5 0% 0% 0% 0% 0% 1. Counterclockwise 2. Clockwise 3. Zero 4. Up the left edge and from right to left along the top edge 5. Through the middle of the page
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In the experiment shown: 1 2 3 4 0% 0% 0% 0% 1. there is a steady reading in G as long as S is closed 2. the current in the battery goes through G 3. there is a current in G just after S is opened or closed 4. since the two loops are not connected, the current in G is always zero
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Consider the copper ring of radius shown in the figure. It is paced in a uniform magnetic field pointing into the page, that icreases as function of time. The resulting chan r B Induced electric fields ge in magnetic flux induces a current i in the counterclock-wise (CCW) direction. The presence of the current in the conducting ring implies that an induced electric field must be present in order to set the electrons on motion. Using the argument above we can reformulate Farada i E y's law as follows: A changing magnetic field produces an electric field The induced electric field is generated even in the absense of the copper ring. Note : (30 –14)
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Consider the circular closed path of radius shown in the figure to the left. The picture is the same as that in the previous page except that the copper ring has been removed.
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Lecture 14 with notes - Lecture 14 March 4, 2010 Chapter 30...

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