Q.

Figure shows a ring of radius ‘a’ at t = 0, present in a uniform magnetic field B. The magnetic field is present everywhere parallel to the axis yy'  . If ring starts rotating with an angular speed   ω about axis   yy', the induced emf in ring is

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a

π a2B ω sin ωt

b

π a2B ω cos ωt

c

π a2B ω

d

Zero

answer is D.

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Detailed Solution

Flux over the ring is always zero
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Figure shows a ring of radius ‘a’ at t = 0, present in a uniform magnetic field B. The magnetic field is present everywhere parallel to the axis yy'  . If ring starts rotating with an angular speed   ω about axis   yy', the induced emf in ring is