Question

A magnet is moving into a coil of wire as a result of it current is induced. If the magnet is pulled back out of the coil in the opposite direction as it went into the coil, identify which of the following will occur?

• A. There will be a current produced in the coil in the same direction as before
• B. There will be a current produced in the coil in the opposite direction as before.
• C. There will be no current produced in the coil
• D. The current produced must be stronger than before
• E. The current produced must be weaker than before.

Answer 1

The correct option is B There will be a current produced in the coil in the opposite direction as before.

The current is induced in the coil to oppose the change in flux in the coil due to moving magnet. Hence when the direction of movement of magnet changes, the direction of current also changes to oppose change in flux in the opposite direction.