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30 March, 02:49

3. When does the iron core in an electromagnet become magnetic?

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  1. 30 March, 06:03
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    Answer: When electricity flows through it.

    Explanation:

    The electromagnet exhibits magnetic properties only as soon as current flows through the nucleus. Namely, the electric current in the space around the electrical conductor through which it passes creates a magnetic field. Unlike a permanent magnet, which has a permanent property of magnetism, the electromagnet is a temporary magnet because the magnetic field also disappears when the current ceases.
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