Question: In a Van de Graaff type generator a spherical metal shell is to be a 15 10 V electrode. The dielectric strength of the

In a Van de Graaff type generator a spherical metal shell is

In a Van de Graaff type generator a spherical metal shell is to be a 15 10 V electrode. The dielectric strength of the gas surrounding the electrode is 5 107 Vm. What is the minimum radius of the spherical shell required? (You will learn from this exercise why one cannot build an electrostatic generator using a very small shell which requires a small charge to acquire a high potential.)

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