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
187I 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.
3is answer μ I i π r2 /2R
Sushovan Halder yes.thanks.