Definition: Self-inductance or in other words inductance of the coil is defined as the property of the coil due to which it opposes the change of current flowing through it. Inductance is attained by a coil due to the self-induced emf produced in the coil itself by changing the current flowing through it.
Mutual inductance
Magnetic flux, linked with the secondary coil due to to the unit current flowing in the primary coil,
ϕ2 = MI1
