What is the shape of the magnetic field formed by a wire that has a current?

Question

a circle around the wire
a square centered around the wire
a circle north of the wire
an oval around both ends of the wire

Answer 1

The shape of the magnetic field formed by a wire that has a current is a circle around the wire. The direction of the magnetic field is determined by the right-hand rule, where the thumb points in the direction of the current and the fingers curl in the direction of the magnetic field. The strength of the magnetic field is directly proportional to the current in the wire and inversely proportional to the distance from the wire.