Inductance Notes & Topics for GATE EE/IES/ISRO/BARC 2019

By BYJU'S Exam Prep

Updated on: September 25th, 2023

In this article, you will find the Study Notes on Inductance which will cover the topic as Introduction, Magnetic Energy & Inductance relation.

  • Induction of an electromotive force occurs in a circuit by varying the magnetic flux linked with the circuit.
  • From the Faraday’s law, the concept of Inductance may be derived from the property of an electric circuit by which an electromotive force is induced in it as the result of a changing magnetic flux.
  • Inductance L may be defined in terms of the electromotive force generated to oppose a change in current ΔI in the given time duration Δt.

Emf = -L (ΔI) / (Δt)

  • Unit for L is Volt Second / Ampere = Henry.
  • 1 henry is 1 volt-second / ampere.
  • If the rate of change of current in a circuit ΔI / Δt is one ampere per second and the resulting electromotive force is one volt, then the inductance of the circuit is one henry.
  • Since emf results due to the rate of change of magnetic flux , inductance L may also be defined as a measure of the amount of magnetic flux φ produced for a given electric current I as: L = φ/I, where the inductance L is one henry, if current I of one ampere, produces magnetic flux φ of one weber.
  • For an inductor of inductance L,

12-Inductance_files (1)

  • Energy in a magnetostatic field

12-Inductance_files (2)

  • Inductance is defined as

12-Inductance_files (3)

All the Best.

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