(a) How does an electromagnet differ from a permanent magnet ?

(b) Name two devices in which electromagnets are used and two devices where permanent magnets are used.

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Solution

An electromagnet produces a magnetic field so long as current flows in its coil i.e., it produces temporary magnetic field.; but a permanent magnet produces a permanent magnetic field.

(b) Electromagnets are used in :
Electric bell, electric motors
Permanent magnets: Refrigerator doors, toys

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