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21 February, 12:39

When asked how to create an electromagnet, the best answer would be, "You can create an electromagnet by

A. applying a direct current to a non-magnetic material in order to create an electromagnetic field."

B. covering a wire with insulation and applying a direct electrical current to the magnet."

C. coiling a ferromagnetic material, wrapping in an insulator, and applying a current to the coil."

D. wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current."

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  1. 21 February, 13:29
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    Choice-D will do the job nicely.
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