In the beginning of nineteenth century, Oersted discovered that the magnetic field exists around a current carrying conductor. in the words, magnetism can be created by means of an electric current in a conductor in 1831, Michael Faraday, the famous English scientist discovered that this could be done. He demonstrated that when the magnetic flux linking a conductor changes, an e.m.f is induced in the conductor. The phenomenon is known as electromagnetic induction. the great discovery of electromagnetic induction by Faraday through a series of a brilliant experiments has brought a revolution in the Engineering world. Most of the electrical devices are based on this principle. in this chapter, we shall confine our attention to the various aspects of electromagnetic induction ."Magnetic lines of force from closed loop. Magnetic flux linking the conductor means that the magnetic flux embraces it encircles the conductor."
When the magnetic flux linking a conductor changes, an e.m.f is induced in the conductor. if the conductor forms a complete loop or circuit, a current flow in it. this phenomenon is know as electromagnetic induction. Two things are worth noting. first, the basic required for electromagnetic induction is the change in magnetic flux linking the conductor. secondly, the e.m.f and hence the current in this conductor will persist so long as this changes is taking place. To demonstrate the phenomenon of electromagnetic induction, consider a coil C of several turns connected to a centre zero galvanometer G. If a permanent magnet is moved towards the coil, it will be observed that the galvanometer in one direction. if the magnet is moved away from the coil, the galvanometer again show deflection but in the opposite direction. in either case, the deflection will persist so long as the magnet is in motion. the production of e.m.f and hence current in coil C is due to the when the magnetic is in motion. the amount of magnetic-flux linking the coil changes the basic requirement for inducing e.m.f in the coil. if the movement of the is magnet is stopped, through the magnetic flux is linking the coil, there is no change in magnetic flux and hence no e.m.f is induced in the coil. the deflection of the galvanometer reduces to Zero.
When the magnetic flux linking a conductor changes, an e.m.f is induced in the conductor. if the conductor forms a complete loop or circuit, a current flow in it. this phenomenon is know as electromagnetic induction. Two things are worth noting. first, the basic required for electromagnetic induction is the change in magnetic flux linking the conductor. secondly, the e.m.f and hence the current in this conductor will persist so long as this changes is taking place. To demonstrate the phenomenon of electromagnetic induction, consider a coil C of several turns connected to a centre zero galvanometer G. If a permanent magnet is moved towards the coil, it will be observed that the galvanometer in one direction. if the magnet is moved away from the coil, the galvanometer again show deflection but in the opposite direction. in either case, the deflection will persist so long as the magnet is in motion. the production of e.m.f and hence current in coil C is due to the when the magnetic is in motion. the amount of magnetic-flux linking the coil changes the basic requirement for inducing e.m.f in the coil. if the movement of the is magnet is stopped, through the magnetic flux is linking the coil, there is no change in magnetic flux and hence no e.m.f is induced in the coil. the deflection of the galvanometer reduces to Zero.
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