question_answer

A circular loop of radius r carrying a current i is held at the centre of another circular loop of radius\[R(>>r)\]carrying a current I. The plane of the smaller loop makes an angle of \[30{}^\circ \]with that of the larger loop. If the smaller loop is held fixed in this position by applying a single force at a point on its periphery, what would be the minimum magnitude of this force? If it is\[\frac{{{\mu }_{0}}\pi iIr}{aR}\]. Find a.

Answer:

4.00