The movement of a bar magnet into a wire coil attached to an ammeter is one of Englishman Michael Faraday's famous demonstrations. Here are the basic observations:
|Here the magnet is being pushed into the coil.|
The ammeter shows current induced in a positive direction.
|Now the magnet is stationary inside the coil.|
There is no current being produced in the coil, shown by the zero reading on the ammeter
|Finally the magnet is being pulled out.|
The ammeter shows current being induced in the opposite direction to before.