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Question

# The number of turns in the coil of an a.c. generator is 5000 and the area of the coil is 0.25 m2. The coil is rotated at the rate of 100 cycle per second in a magnetic field of 0.2 T. The peak value of the emf generated is nearly

A
157 kV
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B
220 kV
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C
440 kV
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D
786 kV
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Solution

## The correct option is A 157 kVPeak value of emf generated by a.c. generator is, ε=BANω=BAN(2πf) ε=0.2×0.25×5000×2×3.14×100 ε=157×103 V (or) ε=157 kV <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, (A) is the correct answer.

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