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Q.

An a.c. generator is made up of a 1000-turn coil with a 3m2 cross-sectional area that rotates at 60 rad per sec in a uniform magnetic field of 0.04 T. The coil has a resistance of 500. Calculate the generator’s maximum current draw.

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a

0.55 A

b

14.4 A

c

6.25 A

d

2500 A

answer is B.

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Detailed Solution

 e0=nBωA=100×0.04×3×60=720V
The maximum current drawn  Imax=e0R=720500=1.44 A

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