The figure shows a bar magnet and a long stra | vedclass

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(D) The magnetic field produced by the long straight wire $W$ at any point on the magnet is given by the right-hand rule. Since the current is into th

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The magnet experiences a force along the line of shortest distance.

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(D) The magnetic field produced by the long straight wire $W$ at any point on the magnet is given by the right-hand rule. Since the current is into the plane of the paper,the magnetic field lines are concentric circles around the wire.Because the point $P$ is the midpoint of the bar magnet,the magnetic field produced by the wire at the North pole $(N)$ and the South pole $(S)$ of the magnet will be symmetric with respect to the line of shortest distance.The force on the North pole $(F_N = mB_N)$ and the force on the South pole $(F_S = mB_S)$ will have equal magnitudes and opposite directions relative to the axis of the magnet,but their components along the line of shortest distance will be in the same direction.Since the magnetic field is symmetric about the line of shortest distance passing through the midpoint $P$,the net torque on the magnet about its center $P$ is zero.However,the net force on the magnet will be directed along the line of shortest distance towards or away from the wire,depending on the orientation of the magnet's poles.

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