If the density of charge on a surface exceeds about 5 × 10−5 C/m2, the electrostatic forces exerted by the cha?
If the density of charge on a surface exceeds about 5 × 10−5 C/m2, the electrostatic forces exerted by the charge will be strong enough to ionize air near the surface, making the air a conductor and thus draining the charge away from the surface. What is the maximum charge that can be put on the surface of a sphere 2 cm in diameter?
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Surface area of a sphere = 4πr²
Charge = area *surface density = 4πr²*5e-5
= 4*π *0.01²*5e-5 = 6.28e-8 C.
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