Question: A small plastic sphere is suspended from a fine insulating thread near, but not touching, the sphere of a Van de Graaff generator that is

A small plastic sphere is suspended from a fine insulating thread near, but not touching, the sphere of a Van de Graaff generator that is being charged. It is observed that the plastic sphere is slowly attracted toward the Van de Graaff sphere and eventually touches it, at which point it is violently repelled. Carefully explain these observations

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