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what combination of materials for a van de graaff generator would give highest voltage? Answered


As kiteman says- take your pick from the list.

Your area of interest is in the Triboelectric series that shows how well different materials generate static electricity

See it here

i am wondering which material would be best for the belt as i have seen van de graaff's belts made of a variety of materials


The further apart a pair of materials are listed, the better the effect, especially if one is positive and the other negative.