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Energy stored in an Inductor is used to move electrons

Physics Asked on March 14, 2021

I was reading about the energy stored in an Inductor and first of all I had the question that is this actually stored? The inductor produces a magnetic field which exerts a force on electrons. Isn’t the energy spent on this?

While in a capacitor it doesn’t exert any force as charges don’t flow in between capacitors so I understood the energy stored in field of a capacitor. But I couldn’t understand in an inductor. If someone could explain I would be grateful.

One Answer

A constant current flowing in an ideal inductor produces a magnetic field which does not change as long as the current does not change. If an external effect tends to decrease the current, the the field strength decreases. The change in the magnetic flux produces an electromotive force in the coil which tends to maintain the existing current. In a capacitor, an external voltage forces charge onto the plates. If the voltage is removed, the charge looks for a way to get off of the plates.

Answered by R.W. Bird on March 14, 2021

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