Why are there charged particles on the dome of the van de graaff generator?

Charged particles accumulate on the dome of a Van de Graaff generator due to the process of electrostatic induction and charge transfer. As the generator operates, a moving belt transports charge to the dome, which becomes positively or negatively charged depending on the design. This charge distribution creates an electric field, allowing the dome to hold a significant amount of charge until it is discharged. The high voltage achieved can be used for various applications, including particle acceleration and experiments in physics.