An alternately expanding and contracting magnetic field is produced by
A)a stationary magnet.
B)a steady current flowing in a wire.
C)a battery.
D)none of the above

Question

Quizplus · Accepted Answer

An alternately expanding and contracting magnetic field is not produced by any of the options given. A stationary magnet produces a constant magnetic field, a steady current results in a constant magnetic field around the wire, and a battery on its own does not produce a magnetic field unless it's causing a current to flow in a circuit, and even then, the field would not alternately expand and contract unless the current's direction or magnitude is changing.

An Alternately Expanding and Contracting Magnetic Field Is Produced by