Magnetic Effects Of Current Question 371
Question: 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.
Solution:
Answer: 4.00
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