eli5: what happens when dielectric is place between the capacitor plates?

Question

eli5: what happens when dielectric is place between the capacitor plates?

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Answer 1

What do you mean placed? Unless the plates were touching before (wich stops making it a capacitor) you can only replace the dielectric air that was there before.

Do you mean putting one in that has a higher permittivity? Then it depends if your capacitor is charged and if it’s connected to a supply voltage. (If it’s charged but disconnected voltage will increase, if it’s connected to a voltage charge will decrease)