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Capacitor Charge and Change in Dielectric

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An air-filled capacitor is connected across a 200-V voltage source.

a) If the air-gap between the two plates is 0.5 mm and the area A of the plates is 0.2 m^2, what is the capacitance?
b) After the source fully charges the capacitor, the capacitor is immersed in transformer oil, whose dielectric constant is k = 4.5. What is the change of the electric energy ΔU in the capacitor if the voltage source remained connected during the process?
c) What is the change of the electric energy ΔU in the capacitor if the voltage source disconnected before it is immersed in the oil?

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This posting contains the solution to given problems on an air-filled capacitor connected to a 200-V voltage source.

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a. We use the formula to compute the capacitance of a parallel plate capacitor. The dielectric constant of air is ...

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