Calculate the capacitance of a parallel-plate capacitor having 20 cm xx 20 cm square plates separated by a distance of 1.0 mm.
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The capacitance is `C= epsilon_0A/d` =8.85 xx 10^(-12) F m^(-1) xx 400 xx 10^(-4) m^2/1 xx 10^(-3) m` `=3.54 xx 10^(-10) F~~350 pF`.
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