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How much energy is stored by the electric field between two square plates, 8.4 cm on a side, separated by a 3.2 mm air

How much energy is stored by the electric field between two square plates, 8.4 cm on a side, separated by a 3.2 mm air gap? The charges on the plates are equal and opposite and of magnitude 330 C. Express your answer using two significant figures. 17 U= ? J

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