Concept of Self Inductance
Self Inductance or Inductance is defined as the property of a material due to which it opposes the flow of current through it. It is usually denoted by ‘L’ and its SI unit is Henry. How a material possess such property? To understand, let us consider a coil having N number of turns and connect the coil through an AC source. Qualitative Analysis of Self Inductance Let the current flowing through the coil is i = ImSinωt. Since the current is changing through the coil, therefore the magnetic field will also change. If the cross sectional area of the coil is assumed to be A then magnetic flux linking a coil will be BA where B is magnetic flux density. Total flux linkage through N turns Ø = NBA According to Faraday’s Law of Electromagnetic Induction , the changing magnetic flux will cause an emf to develop. This induced emf in the coil will oppose the cause as per Lenz’s Law . Here cause is alternating current. Therefore the coil will oppose the flow of current....