what is Mutual induction

It is found that the magnetic flux linked with the secondary coil due to unit current flowing through primary coil is known as mutual inductance btwn two coils

if there is a change in the magnetic flux linked with a coil, there is also a change of flux linked with the neighbouring coil, thence producing an induced emf in the second coil. This phenomenon of producing an induced emf in a coil due to the change in current in the other coil 

 

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