A magnetised needle in a uniform magnetic field experiences a torque but no net force. An iron nail near a bar magnet, however, experiences a force of attraction in addition to a torque. Why?
Answer
In a uniform magnetic field, net force is zero but there is torque due to equal and opposite forces which tends to rotate the magnetic needle. The iron nail experiences a non-uniform field due to the bar magnet. Therefore, it experiences both force and torque.
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