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I don’t know how to solve the following problem: Plate capacitor, with surface of electrodes S and distance between them, d , have perfectly uniform dielectric with relative permitivitty Ɛ r . Capacitor is connected to the generator of constant voltage U . Then, capacitor is separated from the generator and dielectric is drawn out so that electrodes are in the same place. What is the energy of capacitor while drawing out the dielectric? Result: W e =Ɛ r 2 Ɛ 0 SU 2 /(2d) Could someone help? Thanks for replies.

I don’t know how to solve the following problem:
Plate capacitor, with surface of electrodes S and distance between them, d, have perfectly uniform dielectric with relative permitivitty Ɛr. Capacitor is connected to the generator of  constant voltage U. Then, capacitor is separated from the generator and dielectric is drawn out so that electrodes are in the same place. What is the energy of capacitor while drawing out the dielectric?
 
Result:
Wer2Ɛ0SU2/(2d)
 
Could someone help?
Thanks for replies.

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