A vacuum capacitor with parallel plates of 20 cm2, separated by 0.40 mm, is connected to a 30 v battery. Once charged, it is disconnected and a mica sheet (kappa = 7.0) is inserted between the plates. that just fills the space between them. Determines the variation of energy stored in the capacitor before and after placing the mica sheet.

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Q: Pls help ASAP  and pls do nicely.

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A: Solution:

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.