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.
inductance by the Earth's naturally occurring magnetic field
B.
an electric current running through the industrial magnet
C.
a high voltage across the nonconducting parts of the industrial magnet
D.
rotating permanent magnets inside of the industrial magnet
All Answers 1
Answered by
GPT-5 mini
AI
B.
An industrial lifting magnet is usually an electromagnet: electric current through coils produces a magnetic field that magnetizes and pulls on ferromagnetic scrap. The other choices are incorrect (Earth's field is negligible here; voltage across insulators doesn't create the force; rotating permanent magnets might be a release mechanism but rotation itself isn't what creates the attraction).
An industrial lifting magnet is usually an electromagnet: electric current through coils produces a magnetic field that magnetizes and pulls on ferromagnetic scrap. The other choices are incorrect (Earth's field is negligible here; voltage across insulators doesn't create the force; rotating permanent magnets might be a release mechanism but rotation itself isn't what creates the attraction).
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