what are permanent magnets and elctromagnets? gove two uses of each.

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Solution

The substances which at room temperature retain their ferromagnetic property for a long period of time are called permanent magnets.
Uses:
These are used in Compass, Magnetic stickers.
An electromagnet is made from a coil of wire which acts as a magnet when an electric current passes through it.
Uses:
These are used in speakers, electric Bell etc.

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What is the reason behind the use of electromagnets instead of permanent magnets in power generators.

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