A potential difference can be induced (created) in a conductor when there is movement between the conductor and a magnetic field. This can occur in two different ways:
The induced voltage produces an induced current if the conductor is connected in a complete circuit. As with all currents, the induced current creates a magnetic field around itself. Note that this magnetic field opposes the original change. For example, if a magnet is moved into a coil of wire, the induced magnetic field tends to repel the magnet back out of the coil. This effect occurs whether a magnet is moved into a coil, or a coil is moved around a magnet.
The direction of the induced potential difference or induced current depends on the direction of movement. The current is reversed when:
The images illustrate how this works.
An induced potential difference or induced current will increase if: