How can you make your motor run in reverse? make sure to try it?

We are asked in what manner can one make the motor run in reverse. One way to do so is to flip the magnet on the other side so that the opposite charge faces to the motor. The magnetic field induced by the magnet to the motor results to a reactive force opposite to the induced motion. 

Efficiency is an action of doing something. for example when you take a test. good efficiency means you did well but bad effeciency or no effiency means you did bad.

Ithink the answers is b i hope it my friend message me if i’m wrong and i’ll change my answer and fix it for you