Basic Electrical Engineering - 9. DYNAMICALLY & STATICALLY INDUCED EMF || Self & Induced EMF || In Nepali

Induced e.m.f can be either dynamically induced emf or statically induced emf. in this first case, usually the field is stationary and conductors cut across it (as in d.c. generator). But in the second case, usually the conductor or the coil remains stationary and flux linked with it is changed by simply increasing or decreasing the current producing this flux (as in transformers). Dynamically Induced EMF We have learnt that when the flux linking with the coil or circuit changes, an emf is induced in the coil or circuit. EMF can be induced by changing the flux linking in two ways: By increasing or decreasing the magnitude of the current producing the linking flux. In this case, there is no motion of the conductor or of coil relative to the field and, therefore, emf induced in this way is known as statically induced By moving a conductor in a uniform magnetic field and emf produced in this way is known as dynamically induced emf STATICALLY INDUCED EMF Statically induced emf may be (a) self-induced emf or (b) mutually induced emf Self-Induced EMF When the current flowing through the coil is changed, the flux linking with its own winding changes and due to the change in linking flux with the coil, an emf, known as self-induced emf, is induced. Since according to Lenz’s law, an induced emf acts to oppose the change that produces it, a self-induced emf is always in such a direction as to oppose the change of current in the coil or circuit in which it is induced. This property of the coil or circuit due to which it opposes any change of the current in the coil or circuit, is known as self-inductance. The emf induced in a coil due to the change of flux produced by another neighbouring coil linking to it, is called Mutually Induced emf. Let us take an example to understand the phenomenon of mutually induced emf. ...................................................................................................................... EduLogue By Bikram Acharya Connect with EduLogue on: ========================================= EMAIL : [email protected] FACEBOOK : https://www.facebook.com/EduLogue YOUTUBE : https://www.youtube.com/c/EduLogue #ElectricCircuit #Faradayslawofelectromagneticinduction #dynamicallyandstaticallyinducedemf #selfinducedemfmutuallyinducedemf #selfinducedemf #mutuallyinducedemf