19_Chapter 20 HomeworkCH20 Induced Voltages and Inductance

19_Chapter 20 HomeworkCH20 Induced Voltages and Inductance...

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Induced Voltages and Inductance 193 20.51 According to Lenz’s law, a current will be induced in the coil to oppose the change in magnetic flux due to the magnet. Therefore, current must be directed from b to a through the resistor, and V a V b will be negative . 20.52 While the coil is between the poles of the magnet, the component of the field perpendicular to the plane of the coil is 0.10 T i B = . After the coil is pulled out of the field, . The magnitude of the average induced emf as the coil is moved is 0 f B ( ) ( ) B BA B NN N tt ∆∆ ∆Φ == = A t ε and the average induced current in the galvanometer is () ( ) 2 3 10 0.10 T m 2.0 10 A 3100 A NBA RR t µ 0 0.020 0.20 s π 3.1 I = ∆Ω = This means the galvanometer will defi
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