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(A) The magnetic field produced by a circular loop carrying current $I_2$ at any point on its axis is directed along the axis itself.When a straight c

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zero

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(A) The magnetic field produced by a circular loop carrying current $I_2$ at any point on its axis is directed along the axis itself.When a straight conductor carrying current $I_1$ is placed along the axis of this loop,the current in the straight wire flows parallel to the magnetic field lines produced by the loop.The magnetic force on a current-carrying element is given by $\vec{F} = I(\vec{dl} 	imes \vec{B})$.Since the current in the straight conductor is parallel to the magnetic field $\vec{B}$ produced by the loop,the angle $	heta$ between the current element $I_1\vec{dl}$ and the magnetic field $\vec{B}$ is $0^\circ$ or $180^\circ$.Therefore,the force $F = I_1 dl B \sin(	heta) = 0$.By Newton's third law,the force exerted by the loop on the straight conductor is zero,and consequently,the force exerted by the straight conductor on the loop is also zero.

$A$ straight current-carrying conductor is kept along the axis of a circular loop carrying current. The force exerted by the straight conductor on the loop is

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