Phys 0175 - Lecture 28

Phys 0175 - Lecture 28 - Lecture 28 (Mar. 25, 2009):...

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Lecture 28 (Mar. 25, 2009): Induction and Inductance (cont’d): Induced electric fields Inductors and inductance Self-induction
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Induced Electric Fields: A changing magnetic field produces an electric field: Rewrite Faraday’s Law as: Fig. (a): If we place a copper ring of radius r in a uniform magnetic field and then change the magnitude of the B field, the magnetic flux through the ring will change and an induced emf, and hence an induced current, will appear in the Cu ring. We conclude that an electric field must be present along the ring. Figs. (b) and (c): Now there is no Cu ring. Instead, we consider the electric field that is produced by the changing magnetic flux around a hypothetical circular path of radius r. By symmetry, the electric field induced at points around this path must be tangent to the circle. Hence the induced electric field lines are concentric circles. B
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Phys 0175 - Lecture 28 - Lecture 28 (Mar. 25, 2009):...

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