Induced EMF - Does Voltage Change Matter?

AI Thread Summary
When the voltage to a solenoid is increased from 10V to 20V, the magnetic flux through the coil increases, and an induced electromotive force (emf) opposes this change. If the power supply is switched to a 10V AC source, there will consistently be induced emf opposing changes in flux. Induced emf can occur both due to changes in the solenoid's own current and from external influences, such as moving a magnet towards the solenoid. This understanding highlights the fundamental principle of electromagnetic induction. The discussion confirms that induced emf is a response to any change in magnetic flux.
whitegheghe10
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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?

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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whitegheghe10 said:
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.

whitegheghe10 said:
what if i now change it to a 10V ac power supply
so will there always be induced emf to oppose the change?
Yes.
whitegheghe10 said:
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.
 
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