A potential difference $V_{ab}=40\mathrm{.}0V$ is applied across the capacitor network of $.$

Part A

If $C_1=C_2=4\mathrm{.}00F$ and $C_4=8\mathrm{.}00F,$ what must the capacitance $C_3$ be if the network to store $2\mathrm{.}80{10}^{-3}J$ of electrical energy?

Express your answer with the appropriate units.

$C_3=$

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