Magnetic disk, electric motors, speakers, relays use which of the foll

1.	Magnetic disk, electric motors, speakers, relays use which of the following elements?
A.	Geothermal energy
B.	Hydrochemical agents
C.	Electromagnets
D.	None of these
Answer» D. None of these

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Magnetic disk, electric motors, speakers, relays use which of the following elements?

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