ou move a bar magnet two inches through a coil of wire. What do you observe in a galvanometer hooked up to the coil?
The pointer does not move.
The pointer moves one direction and then stops in that position.
The pointer moves one direction and then goes back to center.
The pointer swings one way and then swings the other way.
When you move a bar magnet two inches through a coil of wire, you observe a current flow in the coil and the galvanometer hooked up to the coil shows a pointer swing one way and then swing the other way. This is because when a magnetic field moves across a conductor, it induces a voltage and thus a current in the conductor. The direction of the current flow in the coil changes as the polarity of the magnetic field from the moving bar magnet changes. Hence, the galvanometer's pointer swings first in one direction and then in the opposite direction.
