Question

Which statement about an electromagnet is true? A. It doesn’t function without a source of current. B. The core is made from a nonmagnetic material. C. It uses moving magnets to create an electric field. D. It creates a permanent and strong magnetic field.

Answer 1

An electromagnet is only magnetic when there's electric current flowing through its coils (A).  When there's no current flowing through it, it just lays there like a lump of iron with wire wound around it.  

Answer 2

The answer is A

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