Question

what are electromagnets ? How its strength can be changed
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Answer 1

Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. ... As the current flowing around the core increases, the number of aligned atoms increases and the stronger the magnetic field becomes.

Answer 2

Answer:

Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. ... As the current flowing around the core increases, the number of aligned atoms increases and the stronger the magnetic field becomes.

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