2  Self-inductance
In the previous sub-section, we considered the flux in one solenoid due
to the current in the other It is also possible that emf is induced in a
single isolated coil due to change of flux through the coil by means of
varying the current through the same coil This phenomenon is called
self-induction In this case, flux linkage through a coil of N turns is
proportional to the current through the coil and is expressed as
NB
I
Φ ∝
B
L
N
I
Φ
=
(6