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Magnetic Effects of Electric Current
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30/07/2021 10:58 am
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(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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30/07/2021 10:59 am
(a) 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: Electric bell, electric motors Permanent magnets: Refrigerator doors, toys.