Question

A magnetised needle in a uniform magnetic field experience a torque but no net force . An iron nail near a bar magnet however experience a force of attraction in addition to a torque . How??

Answer 1

A magnetised needle just experience a torque because it is magnetised. But an iron nail (magnetic substance)when brought in the vicinity of a magnet aquires magnetic properties, developing an opposite pole . For example if the south pole of magnet is towards nail a north pole is developed or induced and vice versa. Since unlike poles attract each other , therefore the naill gets attracted.
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