Question

1. How much energy is stored by the electric field between two square plates, 7.1 cm on a side, separated by a 2.1-mm air gap? The charges on the plates are equal and opposite and of magnitude 16 nC .

Express your answer using two significant figures and include the appropriate units.

2.

How much work must be done to reduce the plate separation from dd to 12d? The area of each plate is A.

Express your answer in terms of the variables Q, d, A and the constant ϵ0

Answer 1

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