Induced Voltages and Inductance19320.51According 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 bto athrough the resistor, and VaVb−will be negative . 20.52While the coil is between the poles of the magnet, the component of the field perpendicular to the plane of the coil is 0.10 TiB=. After the coil is pulled out of the field, . The magnitude of the average induced emf as the coil is moved is 0fB≈( )( )BBABNNNtt∆∆∆Φ===At∆εand the average induced current in the galvanometer is ()()2310 0.10 Tm2.010A3100 ANBARRtµ−00.020 0.20 sπ3.1I−∆=∆Ω=×=This means the galvanometer will defi
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