Which of the following will cause an induced current in a coil of wire?

the constant field of the earth passing through the coil

a magnet resting near the coil

a magnet being moved into or out of the coil

a wire carrying a constant current near the coil

The answer is b.)

Explanation:

The following are given as causes for an induced current in a coil of wire:

a.) a magnet resting near the coil.

- This not true as there will be no change in flux. Only a change in flux

will lead to the production of an induced current.

b.) a magnet being moved into or out of the coil.

- This is TRUE. This will lead to a change in flux which will lead to the

production of an induced current.

c.) constant current flowing through a wire placed near the coil.

- This is not true as there will not be any change in flux.