Emf of self induction
There is an emf induced in a coil wherever there is a change in the magnetic flux threading the coil. In the examples there considered the source of the flux was outside the coil in which the change occurred. But even where there is a changed in the current in the coil itself, the flux threading the coil changes and an emf in induced in the coil, such an emf induced by changes of current in the coil itself, is called an emf of self-induction.
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