Electromagnets

Magnets that keep their magnetic force for a long time are called permanent magnets. Not all magnets are permanent. Electricity can be used to make magnets that can be switched on and off. These magnets are called electromagnets. Electromagnets are found in many electrical tools and appliances, including doorbells, telephones, and washing machines.

An electromagnet, like this one, can be made using an iron nail and a 6-volt battery.
An electromagnet, like this one, can be made using an iron nail and a 6-volt battery.View Larger Image
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