Question

The magnetic field lines around a long, straight, current-carrying wire are:

Options

• circular and centred on the wire

• straight and parallel to the wire

• elliptical and offset from the wire

• radial lines emerging from the surface of the wire

Answer 1

The magnetic field lines around a long, straight, current-carrying wire are circular and centred on the wire. These circles lie in planes perpendicular to the wire.