The development of electric current with the help of magnetic field is known as electromagnetic induction. Motional EMF It is the EMF or potential difference develop across the ends of wire, when it is in motion in a given magnetic field. Rotational EMF It is the potential difference or EMF induced across the ends of a rotating rod in a given magnetic field. Self-Induction It is the phenomena of induction of EMF are electric current in a loop due to change in its own current or magnetic field. Mutual Induction I t is the phenomena of induction of EMF in a loop or coil due to change in magnetic field of second coil when they are kept co-axillary closed to each other.