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A very small circular loop of radius a i...

A very small circular loop of radius a is initially (at t = 0) coplanar and concentric with a much larger fixed circular loop of radius b. A constant current l flows in the larger loop. The smaller loop is rotated with a constant angular speed `omega` about the common diameter. The emf induced in the smaller loop as a function of time t is

A

`pi(a^2 mu_0 I)/(2b) omega cos (omegat)`

B

`(pi a^2 mu_0 I)/(2b) omega sin (omega^2 t^2)`

C

`(pi a^2 mu_0 I)/(2b) omega sin (omega t)`

D

`(pi a^2 mu_0 I)/(2b) omega sin^2 (omega t)`

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