A parallel plate capacitor has a charge of 0.020 C on each plate with a potential difference

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A parallel plate capacitor has a charge of 0.020 μC on each plate with a potential difference of 240 V. The parallel plates are separated by 0.40 mm of air. 

(a) What is the capacitance for this capacitor? 

(b) What is the area of a single plate? 

(c) At what voltage will the air between the plates become ionized? Assume a dielectric strength of 3.0 kV/mm for air.

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