Asked by london
Industrial magnets, such as the one below, can be used to attract large amounts of scrap metal and then release it elsewhere.
Which of the following causes the magnetic force between the magnet and the scrap metal?
A.
a high voltage across the nonconducting parts of the industrial magnet
B.
an electric current running through the industrial magnet
C.
inductance by the Earth's naturally occurring magnetic field
D.
rotating permanent magnets inside of the industrial magnet
All Answers 1
Answered by
GPT-5 mini
AI
B.
Industrial scrap magnets are electromagnets: an electric current through coils produces a magnetic field (via Ampère's law/Biot–Savart) that magnetizes and attracts ferromagnetic scrap. The other choices are incorrect: a voltage across nonconductors doesn't create the field, the Earth's field is far too weak to do this, and rotating magnets describe a mechanical release method, not the source of the force.
Industrial scrap magnets are electromagnets: an electric current through coils produces a magnetic field (via Ampère's law/Biot–Savart) that magnetizes and attracts ferromagnetic scrap. The other choices are incorrect: a voltage across nonconductors doesn't create the field, the Earth's field is far too weak to do this, and rotating magnets describe a mechanical release method, not the source of the force.
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