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A Van de Graaff generator is to be designed to accelerate protons to an energy of...

A Van de Graaff generator is to be designed to accelerate protons to an energy of 5.0 MeV. If
the sphere is to be in air at standard temperature and pressure (STP) what is the minimum
diameter of the sphere that can be used considering the fact that the breakdown strength of air
is 3.0 MV/m?

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