# Induced emf

Suppose now i have connected a solenoid with a dc power supply of 10V
When i increase the voltage to 20V the magnetic flux through the coil have increased
will emf be induced shortly to oppose the change?

what if i now change it to a 10V ac power supply
so will there always be induced emf to oppose the change?

I am not clear about whether emf will be induced as a result of change in flux just due to change in its own current or will it occur only when the change is cause by external agent ( for example pushing a bar magnet towards the solenoid)

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kuruman
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Suppose now i have connected a solenoid with a dc power supply of 10V
When i increase the voltage to 20V the magnetic flux through the coil have increased
will emf be induced shortly to oppose the change?
Yes.

what if i now change it to a 10V ac power supply
so will there always be induced emf to oppose the change?
Yes.
I am not clear about whether emf will be induced as a result of change in flux just due to change in its own current or will it occur only when the change is cause by external agent ( for example pushing a bar magnet towards the solenoid)
Both.