Which of the following is true of the magnetic field produced by a current in a long, straight wire?
Select an Answer
The field is uniform.
The field increases in strength as the distance from the wire increases.
The field lines are directed parallel to the wire, but opposite to the direction of the current.
The field lines are directed radially outward from the wire.
The field lines form circles about the wire.
The correct answer is that the field lines form circles around the wire. This is a fundamental characteristic of magnetic fields produced by currents.