A current in a long,straight wire produces a magnetic field.The magnetic field lines:

Question

Quizplus · Accepted Answer

The magnetic field lines form circles that go around the wire. This can be demonstrated using the right-hand rule. If you wrap your right hand around the wire such that your thumb points in the direction of the current, the direction of the magnetic field lines will be in the direction of your fingers, which form circles around the wire.

A Current in a Long,straight Wire Produces a Magnetic Field