Question: A typical Van de Graaff generator uses a rubber belt to carry negatively charged electrons from its base to the sphere. As the belt passes

A typical Van de Graaff generator uses a rubber belt to carry negatively charged electrons from its base to the sphere. As the belt passes through the sphere, a metal brush touches it

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Electrons leave the belt and flow through a wire to the surrounding sphere. Why do they flow onto the outside of the sphere rather than staying near the belt?

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