Question

Why is magnetic needle placed in a non-magnetic round box?​

Answer 1

A magnetic needle is kept in a non-uniform magnetic field. It will experience force and torque both. Due to unequal forces acting on the poles, it will experience torque.

Answer 2

Since magnetic field is non-uniform, the force experienced by the north and south poles will be different, hence there will be a net force on the magnetic needle.

When the needle makes an angle θ with the magnetic field, it will experience a torque also.

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