Find the greatest charge density that can exist on a conductor before dielectric

Question

Find the greatest charge density that can exist on a conductor before dielectric breakdown of the air occurs. The potential at a distance r > R from uniformly charged sphere of radius R is where Q is the total charge on the sphere. Find the radius of the equipotential surface of potential (a) 200 V, (b) 220 V, and (c) 240 V for a sphere of radius 20 cm carrying a charge of 6 nC. The potential difference across the plates of a parallel-plate is 500 V when the charge on the plates is 40 mu C. What is the capacitance?

Explanation / Answer

C = Q/V = 40 / 500 = 0.08 F

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