At the center of a fixed large circular coil of radius R, a much smaller circular coil of radius r is placed. The two coils are concentric and are in the same plane. The larger coil carries a current I. The smaller coil is set to rotate with a constant angular velocity $\omega $ about an axis along their common diameter. Calculate the emf induced in their smaller coil after a time t of its start of rotation.

Question

${{{\mu _o}{\rm I}} \over {2\,R}}$ $\omega $ $\pi $ r² sin$\omega $ t

${{{\mu _o}{\rm I}} \over {4\,R}}$ $\omega $ $\pi $ r² sin$\omega $ t

${{{\mu _o}{\rm I}} \over {4\,R}}$ $\omega $ r² sin$\omega $ t

${{{\mu _o}{\rm I}} \over {2\,R}}$ $\omega $ r² sin$\omega $ t

Solution

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