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BdPhO Regional (Dhaka-South) Higher Secondary 2019/3

Posted: Fri Apr 26, 2019 4:44 pm
A large loop of radius $R$ carries a current of $I$. A much smaller loop of radius $r$ is placed at the center of this loop, such that its axis is perpendicular to that of the larger loop. The smaller loop carries a much smaller current $i$. What is the torque on the smaller loop?