What is a permanent magnet and electromagnet? give two uses of each
Answers
Many electric motors, generators and measuring instruments cannot work without permanent magnets. Alnico magnets are used in radar and telephones. They even play an important role in amplifiers and loudspeakers. Ceramic magnets are great for performing attraction and repulsion experiments.
Magnets which have higher retentivity and coercivity and retain the magnetic field even when the applied electric field is removed is called permanent magnet
It is used in lifting heavy objects or in vacuum tubes
An electromagnet is a magnet that is made by passing electricity through a soft iron coil Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it
It is used in various scientific n geometrical instrument
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