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Question

A coil is placed in transverse magnet field of 0.02T. If this coil starts shrinking at a rate of 1mm/sec, while its radius remains 4cm, then what is the value of induced emf?

A
2μV
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B
2.5μV
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C
5μV
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D
8μV
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Solution

The correct option is B 5μV
B=0.02T
ϕ=B.A
=BA
V=dϕdt=×2πrdrdt
=0.02×2×227×4×102×1×103
0.4×22×47μV
=5μV

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