A magnetic needle is placed on a cork floatin | vedclass

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(B) The magnetic needle acts as a magnetic dipole placed in the Earth's uniform magnetic field. $A$ magnetic dipole in a uniform magnetic field does n

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(B) The magnetic needle acts as a magnetic dipole placed in the Earth's uniform magnetic field. $A$ magnetic dipole in a uniform magnetic field does not experience any net force,as the forces on the north and south poles are equal and opposite ($F = mB$ and $F = -mB$). However,it may experience a torque (a couple) that causes it to rotate. As shown in the figure,the forces $mB_H$ act in opposite directions,resulting in zero net force. Therefore,the needle together with the cork will not undergo translational motion towards the north of the lake; instead,it will rotate until it aligns itself parallel to the horizontal component of the Earth's magnetic field,with its north pole pointing towards the geographic north.

$A$ magnetic needle is placed on a cork floating in a still lake in the northern hemisphere. Does the needle together with the cork move towards the north of the lake?

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