What is Van de Graaff generator?

Van de Graaff generator is

Van de Graaff generator is

What is a Van de Graaff Generator?

Why is Van de Grraff generator enclosed in a steel tank filled with air ?

How the leakage of charge can be minimised in Van de Graaff generator?

What limits maximum potential to which the hollow sphere in Van de Graaff generator can be raised?

Why the Van de Graaff generator is enclosed inside an earth connected steel tank filled with air under pressure?

Dielectric strength of air is 3xx10^(6) V.m^(-1). Suppose the radius of a hollow sphere in the Van de Graff generation is R =0.5 m , calculate the maximum potential difference created by this Van de Graaff generator .