In a Van de Graaff generator, what component rubs together to build up charge?

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Multiple Choice

In a Van de Graaff generator, what component rubs together to build up charge?

Explanation:
The key idea is that charge is produced by friction between moving parts. In a Van de Graaff generator, the insulating belt slides over rollers, and the rubbing between the belt and these rollers transfers charges (triboelectric effect). This belt then carries the accumulated charge up to the hollow metal sphere, letting the dome build up a high voltage. The vertical belt is the part involved in this rubbing and charge transfer in the typical design; other components listed don’t participate in generating the charge in this setup.

The key idea is that charge is produced by friction between moving parts. In a Van de Graaff generator, the insulating belt slides over rollers, and the rubbing between the belt and these rollers transfers charges (triboelectric effect). This belt then carries the accumulated charge up to the hollow metal sphere, letting the dome build up a high voltage. The vertical belt is the part involved in this rubbing and charge transfer in the typical design; other components listed don’t participate in generating the charge in this setup.

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