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Q.

The number of turns in the coil of an ac generator is 5000 and the area of the coil is 0.25 m2 . The coil is rotated at the rate of 100 cycles/sec in a magnetic field of 0.2 T. The peak value of the emf generated is nearly

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a

786KV

b

440KV

c

220KV

d

157.1KV

answer is D.

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Detailed Solution

N=5000, A=0.25m2, f=100 cycles/s ,B=0.2TPeak Value of emfe=BANω=BAN(2πf)=0.25×0.2×5000×2×3.14×100157.1KV
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The number of turns in the coil of an ac generator is 5000 and the area of the coil is 0.25 m2 . The coil is rotated at the rate of 100 cycles/sec in a magnetic field of 0.2 T. The peak value of the emf generated is nearly