What Are Electromagnets?

How do electromagnets differ from permanent magnets, and what are they used for?

Physics - Electricity And Circuits - Learning Points.

An electromagnet is created by running an electrical current through a coil of wire.

An electromagnet can be made stronger by increasing the current, adding coils, or placing a steel or iron core inside the coil.

Electromagnets are used whenever a magnetic field that can be switched on or off is needed.

Electromagnets are used in car locks, electric doors, storing computer data, and lifting scrap metal.
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