Answer the following question given this paragraph: 

The current produced by electromagnetic induction is greater when the magnet or coil moves faster, the coil has more turns, or the magnet is stronger. If the magnet or coil is moved back and forth repeatedly, alternating current is produced.


Q: Alternative current is produced when a magnet or coil does what?

 Choices:

- moves in circles at faster rates

- moves at faster velocities

- moves up and down repeatedly

- moves back and forth repeatedly

A:
moves back and forth repeatedly
