Page 68 - Basic Electrical Engineering
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Figure 1.14 Inductance of a coil
The emf induced, e will be
where μ is the permeability of the core material; ℓ is the length of flux path;
A is the area of the coil.substituting,
or,
where
L is called the coefficient of self inductance or simply self inductance of the
coil.
Inductance of a coil is, therefore, dependent upon the permeability of the
core material. If we put iron as the core material instead of any non-magnetic
