SELF INDUCTION PART 01

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SELF INDUCTION: Whenever the current in a coil increases or decreases there is a change in magnetic flux linking the coil. Hence an emf is induced in the coil which is called self induce electromotive force and this phenomena is called self Induction.The number of flux lines linking any given circuit, due to a current in the circuit itself, will depend on the geometry of circuit i.e., its shape, size, number of turn's etc.Statement: "The phenomena in which an opposing induced emf is produced in a coil as a result of change in current or magnetic flux linked with the coil is called self induction".Experiment: Consider a coil connected a battery and a tap key as shown in the figure, Diagram. When the key is pressed, the current starts growing through the coil, as a result the flux linked with the coil also starts growing through it. This produces induced emf in the coil. The direction of the induced emf is such that it opposes the growth of the current in the circuit.When the key is released, the current in the circuit starts decaying as a result flux linked with the coil also starts decreasing which in turn produces induced emf in the coil. This also opposes decay of current in the circuit.It may be observed that an opposing induced emf is produced in the coil during both growth and decay of current. Consider a coil of 'n' turns carrying current 'i' and be the magnetic flux linked with each turn of the coil. Then N will be the flux linkage in the coil.Since the flux is due to current in the coil, the flux linkage will be directly proportional to current 'i'.