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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 
 

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a
π a2B ω sin ωt
b
π a2B ω cos ωt
c
π a2B ω
d
Zero

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detailed solution

Correct option is D

Flux over the ring is always zero

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