The metal sphere of a small Van de Graaff generator
Chapter , Problem 22(choose chapter or problem)
The metal sphere of a small Van de Graaff generator illustrated in Figure 15.23 has a radius of 18 cm. When the electric field at the surface of the sphere reaches 3.0 3 106 V/m, the air breaks down, and the generator discharges. What is the maximum potential the sphere can have before breakdown occurs?
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