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Q. A circular coil of 1 turn and area $0.01\,m^2$ carries a current of 10A . It is placed in a uniform magnetic field of induction 0.1 tesla such that the plane of the circle is perpendicular to the direction of the field, the torque acting on the coil is

Moving Charges and Magnetism

Solution:

$\tau=BAIN\,\cos\,\theta$