A current I1 is passed through the
solenoid S1 and the flux linkage with coil S2 is,
N2F2 = M21 I1
(6 10)
M21 is called the mutual inductance of solenoid S2 with respect to
solenoid S1 The flux due to the current I1 in S1 can be assumed to be confined
solely inside S1 since the solenoids are very long Thus, flux linkage with
solenoid S2 is
(
) (
) (
)
2
2
2
2
1
0
1 1
N
n l
r
n I
Φ
µ
=
π
where n2l is the total number of turns of S2