Performing the simulation:

Help:

 Switch

Turn On/Off: Used to power On/Off the Van De Graaff Generator.

Dissect/Cover: This button used to see the inside of the Van De Graaff Generator.

Slider

Change Length: This is used to change the length of two sphere.

Power On the Van De Graaff Generator by using switch Turn On. Change the length and observe the discharging time for a particular distance.