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As a crude model for lightning, consider the ground to be one plate of a parallel-plate capacitor and a cloud at an altitude of 510m to be the other plate. Assume the surface area of the cloud to be the same as the area of a square that is 0.50km on a side. (Dielectric strength of air is 3.0*10^6 V/m ) Will rate if correct, I really appreciate it. A) What is the capacitance of this capacitor? B) How much charge can the cloud hold before the dielectric strength of the air is exceeded and a spark (lightning) results?

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