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In a Van de Graaff type generator, a spherical metal shell is to be a 15 xx 10^6V electrode. The dielectric strength of the gas surrounding the electrode is 5 xx 10^7 Vm^(-1). 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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Answer» SOLUTION :`V=15 xx 10^(6)V, E=5 xx 10^(7) Vm^(-1) ""R=?, E=V/r` `r=V/E=(15 xx 10^(6))/(5 xx 10^(7))=0.3m` |
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