a current in a long, straight wire produces a magnetic field...?

A current in a long, straight wire produces a magnetic field. These magnetic field lines form circles that go around the wire.
WHY do the magnetic field lines form circles that go around the wire?

James2013-04-07T13:26:32Z

Favorite Answer

Only with Alternating Current (AC). Direct Current (DC) will not form the magnetic field in a straight wire.

The reason for the circular magnetic field is due to the positive and negative field produced by the AC.

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