Electromagnetic or magnetic induction is the production of an electromotive force (i.e., voltage) across an electric conductor
in a changing magnetic field
.
Electromagnetic induction is an incredibly useful phenomenon with a wide variety of applications. Induction is used in power generation and power transmission, and it's worth taking a look at how that's done. There are other effects with some interesting applications to consider, too, such as eddy currents.
Regards
Arun (askIITians forum expert)