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Self-Inductance (L)

An electric current I flowing around a circuit produces a magnetic field Description: 88675.png and, hence, a magnetic flux Description: 88668.png through each turn of the circuit.
If the circuit has N identical turns, then the flux linkage is defined as,
λ = Nϕ
Also, if the medium surrounding the circuit is linear then λ α I or, λ = LI where L is a constant, known as inductance of the circuit.
Description: 88660.png


An inductor is a passive electrical device employed in electrical circuits for its property of inductance. Physically, the inductance L is a measure of an inductor’s ‘resistance’ to the change of current; the larger the value of L, the lower the rate of change of current.

Coupled Inductor

When the magnetic flux produced by an inductor links another inductor, these inductors are said to be coupled. For coupled inductors, there exists a mutual inductance that relates the current in one inductor to the flux linkage in the other inductor. Thus, there are three inductances defined for coupled inductors:
L11 = Self-inductance of the inductor 1
L22 = Self-inductance of the inductor 2
L12 = L21 — the mutual inductance associated with both inductors

Mutual Inductance (M)

Mutual inductance is the ability of one inductor to induce an emf across another inductor placed very close to it.

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