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Question

A coil of circular cross-section having 1000 turns and 4cm2 face area is placed with its axis parallel to a magnetic field which decreases by 102Wbm2 in 0.01s. The e.m.f. induced in the coil is:

A
4mV
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B
0.4mV
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C
200mV
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D
400mV
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Solution

The correct option is D 400mV
Answer is D
From Faraday's law, we know that E=ndϕdt
E=nAdBdtcosθ=1
E=1000×0.010.01×4×104=400mV

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