HCV problem.Aakash sir plz help.

A circular loop of radius R carries a current I.Another circular loop of radius r(<<R) carries a current i and is placed at the centre of the larger loop.The planes of the two circles are at right angle to each other.Find the torque acting on the smaller loop

2 Answers

Swastik Haldar ·

I approached the sum in this way.
since the second circular loop is very small, we can assume it to be a point in the centre of the first loop. magnetic field due to first loop at the centre can be calculated. now using the result for finding the torque, i.e. ( dipole moment x B) I got the answer.

shivendu gupta ·

is answer μ I i π r2 /2R

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