Question

Which of these is not a way to create a changing magnetic field?

A.Moving a magnet relative to a circuit
B.Opening or closing a switch in a circuit
C. All of these create a changing magnetic field
D. Moving a circuit relative to a magnet

Answer 1

Moving a circuit relative to a magnet is not a way to create a changing magnetic field.

Step-by-step explanation:

The correct answer is D. Moving a circuit relative to a magnet. Moving a circuit relative to a magnet does not create a changing magnetic field. Inducing a current in a wire loop requires a change in magnetic field, which can be achieved by moving a magnet relative to a circuit, opening or closing a switch in a circuit, or changing the orientation or strength of the magnetic field. For example, when a magnet is moved through a wire loop, the magnetic field passing through the loop changes, creating an induced current in the wire. This phenomenon is known as electromagnetic induction and is a fundamental principle in physics.