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7 February, 12:44

How can you make a magnet that turns on and off

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  1. 7 February, 12:54
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    You can't turn off a 'permanent' magnet ... a piece of iron that's

    magnetized.

    An electromagnet can be turned on and off. It's only magnetic

    when electric current flows through the wire that's wrapped

    around it. The wire is connected to a battery or other power

    supply. So if there's a switch in the wire, the electromagnet

    can be switched on and off.
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