Electrostatics Question 818

Question: In a Van de Graff generator, a spherical metal shell is to be 15×106V electrode. The dielectric strength of the gas surrounding the electrode is 15×107Vm1. The minimum radius of the spherical shell required is

Options:

A) 1m

B) 2m

C) 1.5m

D) 3m

Show Answer

Answer:

Correct Answer: D

Solution:

[d] Here, V=15×106V

dielectric strength =5×107Vm1

Maximum electric field, E = 10% of dielectric strength

As E=Vr r=VE=15×1065×106=3m



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