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What is mutual inductance?

It is the phenomenon in which a change of current in one coil causes an induced emf in another coil placed near to the first coil. The coil in which current is changed is called primary coil and the coil in which emf is induced is called secondary coil.
EXPLANATION
Consider two coils placed near each other as shown in figure. When current is passed through the primary coil, magnetic flux is produced. This magnetic flux is also linked with the secondary coil. If the current is changed by varying the resistance in the primary circuit, the magnetic flux also change. As this changing flux is linked with the secondary coil, it induces an emf in it. This phenomenon of inducing emf in a coil by changing current in another coil is known as mutual inductance.
 
 
 
 
 
 
 
 
 
 
 
 
 

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View Full Answer

  Mutual inductance is defined as the ratio of emf induced in the secondary coil to the rate of change of electric current in the primary coil.

                                                       e = -M di/dt

Value of ‘M’ depends upon the number of turns of secondary coil, their cross-sectional area, length,

material inside the core

Unit of mutual inductance is Henry.

...........hope i helped u

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