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A conducting circular loop of radius r carries a constant current i. It is placed in a uniform magnetic field B such that B is perpendicular to the plane of the loop. The magnetic force acting on the loop is

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by (15.1k points)

The correct answer is: zero

Net magnetic force on any current carrying loop in uniform magnetic field is zero.


Let's consider a small arc of the circular loop, the force is proportional to IdLxB. Using the right hand rule we see that the force is acting towards the centre. But a similarly elemental arc is exactly opposite to the considered arc. But the current flows in opposite direction. Hence the forces cancel each other.

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