A copper coil is connected to a galvanometer. What would happen if a bar magnet is
- pushed into the coil with its north pole entering first
- held at rest inside the coil
- pulled out again?
Answer:
- When north pole is pushed into the coil, a momentary deflection is observed in the galvanometer. This deflection indicates that a momentary current is produced in the coil. The direction of current in the coil is anticlockwise.
- When the magnet is held at rest, there is no deflection in the galvanometer. It indicates that no current is produced in the coil in this use.
- In pulling the magnet out of the coil, a deflection in opposite direction is observed. It indicates that the current produced in the coil is in opposite direction.