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  4. Assertion: When a magnetic dipole is placed in a non uniform magnetic field, only a torque acts on the dipole. Reason: Force would act on dipole if magnetic field is uniform.

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Q. Assertion : When a magnetic dipole is placed in a non uniform magnetic field, only a torque acts on the dipole.
Reason : Force would act on dipole if magnetic field is uniform.

AIIMSAIIMS 2015Moving Charges and Magnetism

Solution:

In a non-uniform magnetic field, a torque and a net force both act on the dipole. If magnetic field is uniform, net force on dipole would be zero.