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What is electromagnetic Induction(E.M.I.)? Electromagnetic Induction is the phenomenon of generating an e.m.f. by changing the number of magnetic lines of force associated with a circuit. The e.m.f. so generated is called induced e.m.f. and the corresponding current is called induced current. The number of magnetic lines of force crossing surface normally is called magnetic flux liked with the surface. It is represented by ɸ=vector B. vector A= BA cosѳ Where B is strength of magnetic field, A is area of the surface and ѳ is the angle which normal to the surface area makes with the direction of  magnetic field . Thus component of magnetic field normal to the area is significant. If a coil has N turns, then ɸ= BA cosѳ The S.I. unit of magnetic flux is weber which is the amount of magnetic flux over an area of 1 m 2  held normal to a uniform magnetic field of one tesla. The cgs unit of ɸ is Maxwell. 1 weber = 18 8  maxwell When plane of coil is perpendicular to magne...