Question

why mutual INDUCTION occurs?

Answer 1

Mutual inductance occurs when the change in current in one inductor induces a voltage in another nearby inductor. ... When electric current in a primary coil changes, the changing Alternating Current creates a changing magnetic field and thus, an emf is induced in the secondary coil.

Answer 2

The phenomenon according to which an opposing e.m.f. is produced in a coil as a result of growth or decay of current or change in magnetic flux linked with a neighbouring coil is called mutual induction.

If two coils are coupled inductively then the flux linked in an coil depends directly on the instant current in the other coil.

It is found that the magnetic flux (¢) linked with the other coil at an instant is directly proportional to the current passing through the first coil at that instant.i.e,

magnetic flux (¢) is directly proportional to current (I).

¢=MI

where M is called coefficient of mutual inductance.

The value of mutual inductance depend on the linkage of flux which is depending on the separation and orientation of the two coils.

i.e,. M= ¢ / I

The SI unit of mutual inductance is Henry.

The coefficient of mutual inductance is numerically equal to the flux Linked in the coil caused by the unit current flowing in the nearby coil.