AN-C AN- B. Br mag (a) Bmag Bol B S N (b) A- Bmag Boil B (c) Figure 23.7 (a) When this bar magnet is thrust into the coil, the strength of the magnetic field increases in the coil. The current induced in the coil creates another field, in the opposite direction of the bar magnet's to oppose the increase. This is one aspect of Lenz's law-induction opposes any change in flux. (b) and (c) are two other situations. Verify for yourself that the direction of the induced Beoil shown indeed opposes the change in flux and that the current direction shown is consistent with RHR-2.
AN-C AN- B. Br mag (a) Bmag Bol B S N (b) A- Bmag Boil B (c) Figure 23.7 (a) When this bar magnet is thrust into the coil, the strength of the magnetic field increases in the coil. The current induced in the coil creates another field, in the opposite direction of the bar magnet's to oppose the increase. This is one aspect of Lenz's law-induction opposes any change in flux. (b) and (c) are two other situations. Verify for yourself that the direction of the induced Beoil shown indeed opposes the change in flux and that the current direction shown is consistent with RHR-2.
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Calculate the magnitude of the induced emf when the magnet in Figure 23.7(a) is thrust into the coil, given the following information: the single loop coil has a radius of 6.00 cm and the average value of B cos θ (this is given, since the bar magnet’s field is complex) increases from 0.0500 T to 0.250 T in 0.100 s.
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