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

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2 Answers
Swastik Haldar
·20140804 10:11:58
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
·20140804 20:49:30
is answer Î¼ I i Ï€ r^{2} /2R
 Sushovan Halder yes.thanks.Upvote·0· Reply ·20140805 05:15:08