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  4. A conducting circular loop of radius r carries a constant current I. It is placed in a uniform magnetic field B0 such that B0 is perpendicular to the plane of the loop. The magnetic force acting on the loop is

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Q. A conducting circular loop of radius $r$ carries a constant current $I$. It is placed in a uniform magnetic field $B_{0}$ such that $B_{0}$ is perpendicular to the plane of the loop. The magnetic force acting on the loop is

AMUAMU 2006

Solution:

When a current carrying loop is placed in uniform magnetic field.
$\tau=0$ when $\theta=0$, ie, when the plane of the coil is perpendicular to the field.