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Figure 1.15 Mutual inductance of two coils
From (i) and (ii),
or,
where , is called the mutual inductance of the two coils.
(iii)
Similarly, if we calculate the induced EMF in coil 1, due to change in current
in coil 2, we can find the induced EMF e in coil 1 as
1
where
Now, multiplying the expression for M as in (iii) and (iv) above,
