Page 72 - Basic Electrical Engineering
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Thus, we can say that a coil has an inductance of 1 Henry if a current of 1
Ampere flowing through the coil produces a flux linkage of 1 Wb-turn.
1.16 MUTUAL INDUCTANCE
Consider two coils having N and N number of turns placed near each other
1
2
as shown in Fig. 1.15. Let a changing current, i , flow through coil 1. The
1
flux produced by i in N is ϕ . Since coil 2 is placed near coil 1, a part of the
1
1
1
flux produced by coil 1 will be linked by coil 2. Let flux ϕ linked by coil 2 is
2
ϕ = K ϕ where K ≤1.
2
1 1
1
If magnetic coupling between the two coils is very tight, i.e., very good,
the whole flux produced by coil 1 will link the coil 2, in which case the
coefficient of the coupling K will be 1. The induced EMF in coil 2 is e .
1
2
Flux,
