An electromotive force (e.m.f.) will be induced in a conductor when the conductor moves through a magnetic field. This effect is called electromagnetic induction. According to Faraday,s Law, the size of the induced e.m.f. is proportional to the rate of change of the magnetic field. Reversing the direction of movement of the conductor will cause the induced e.m.f. to produce a current in the opposite direction. The direction of induced current can be determined by using the Fleming’s Right Hand Rule.
Induced current in a solenoid…When a magnet bar is thrust into a coil connected to an electric circuit, it causes a current to flow in the circuit to which the coil is attached.
When the magnet is withdrawn, the direction of current is reversed..
Lenz’s Law states that the induced current always acts to oppose the action producing it.
