Question

A capacitor is constructed from two aluminium plates 1.5cm on a side separated by 0.2mm of air.
(A) Calculate the capacitance of the capacitor. (2 sig figures)
(B)Calculate the voltage required to store 1nJ of energy in the capacitor.
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/pplate.html C=epsilon*area/separation

energy=1/2 C*V^2

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