find the energy stored with a dielectric (Er = 8.5) is placed between the plates with the gap between them is decreased by 15% and the voltage goes up to 20 kV.

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If you have a capacitor that stores 2.5 J of energy with an aur gap and power supply at 10 kV, find the energy stored with a dielectric (Er = 8.5) is placed between the plates with the gap between them is decreased by 15% and the voltage goes up to 20 kV. 

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