Explanation
Self Inductance
Self-induction means the coils induce the emf themselves. There is a change in the magnetic flux through that coil and because of this, the current will be induced in the coil by itself. So once the current get induced, the current tries to oppose the flux. Here NΦ ∝ I
NΦ = LI ( L is the self-induction)
Induced emf, E = -N dΦ/(dt) = -N dI/(dt) [ L/N]
E = -L dI/(dt)
This is the self-induced emf. A coil having self-inductance ”L” is said to be the induction coil.
Mutual Inductance
Here, there are two coils placed near each other. The first coil will make turns and carry the current which results in the magnetic field. As both the coils nearly close to each other, the magnetic field through one coil will all pass through the other coil. So one coil causes the change in magnetic flux because of which current is induced in the other coil.
Here there is the primary coil and another one is the secondary coil. This type of induction mainly depends upon the number of turns, size, and shape of the coil and medium between the two coils.
E = -M dI/(dt)
