You can see a magnetic field of a magnet by using:

A. a cell phone
B. your sense of smell
C. iron powder
D. copper wire

Option C

Explanation:

Iron is magnetic, so when you shave it into tiny pieces and use a magnet all the little pieces are going to form the shape of the magnetic field. copper isnt magnetic, option B is just ubsurd, and DONT EVER put a magnet next to your phone, if the magnet is strong enough you could damage it.

Please mark as brainliest :)

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