Select the best choice. If you place a stack of aluminium cups on top of a Van de Graaff generator, what will happen to them? Their charge changes from positive to negative so they keep attracting and repelling. They become oppositely charged and O become attracted to the generator. They become positively charged and O fly off. They do nothing because they're insulated from the ground by the base of the generator.

Select the best choice. If you place a stack of aluminium cups on top of a Van de Graaff generator, what will happen to them? Their charge changes from positive to negative so they keep attracting and repelling. They become oppositely charged and O become attracted to the generator. They become positively charged and O fly off. They do nothing because they're insulated from the ground by the base of the generator.