6. (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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ans a) electro magnet is differ from normal magnet because electro magnet work by electric charge but premanent magnet work always
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a) A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. ... An electromagnet is made from a coil of wire which acts as a magnet when an electric current passes through it.
b) Motors and generators.
Transformers.
Pickups.
Relays.
Electric bells and buzzers.
Loudspeakers and headphones.
Actuators such as valves.
Magnetic recording and data storage equipment: tape recorders, VCRs, hard disks
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