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

A very small circular loop of radius `r` is initially coplanar and concentric with a much larger circular loop of radius `R(gt gtr)` . A constant current `i` is passed in the larger loop which is kept fixed in space and the small loop is rotated with angular velocity `omega` about a diameter. The resistance of the small loop is `R_(0)` and the inductance is negligible.
(a) Find the current in the small loop as a function of time.
(b) Calculate how much troque must be exerted on the small loop to rotate it.

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