Faraday's Law

Faraday’s Law states that a changing Magnetic Field through a coil of wire will “induce” a Current in the wire, called an “induced current”.

The induced current is actually caused by an induced emf . per Ohm’s Law.

The emf is generated by changing the Magnetic Flux, which is done by changing the magnetic field , the area , or the angle between the magnetic field and the area vector.

Faraday’s Law gives the magnitude of the induced emf, while Lenz’s Law gives the direction.

For example: The motional emf for the metal bar on metal rails is: