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Question

A conducting ring of radius 1m is placed in a uniform magnetic field of 0.01T oscillating with frequency 100Hz with its plane at right angle to B. What will be the induced electric field?
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A
πV/m
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B
2V/m
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C
10Vm1
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D
62Vm1
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Solution

The correct option is D 2V/m
After every 0.5T the field will change from B to B
ϵ=2BAT/2=4BAf
E.dl=ϵ
or E=ϵ2πR
=4BπR2f2πR
=BRf=2×0.01×1×100=2Vm1

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