The magnetic moment of a thin round loop with current in the loop of the radius is , and the magnetic induction at its center is equal to
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The figure below shows the north and south poles of a permanent magnet in which n turn coil of area of cross-section A is resting, such that for a current i passed through the coil, the plane of the coil makes an angle with respect to the direction of magnetic field B. The couple acting on the coil is
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