Equation (6 7) would be modified into
N1
1
11
1
12
2
M
I
M
I
Φ =
+
where M11 represents inductance due to the same coil Therefore, using Faraday’s law,
1
2
1
11
12
d
d
d
d
I
I
M
M
t
t
ε = −
−
M11 is the self-inductance and is written as L1 Therefore,
1
2
1
1
12
d
d
d
d
I
I
L
M
t
t
ε = −
−
Example 6