Explain the principle on which Van-de-Graaff generator operates. Draw a labeled schematic sketch and write briefly its working. A Van-de- Graaff type generator is capable of building up potential difference of 15×10 6 V. The dielectric strength of the gas surrounding the electrode is 5×10 7 Vm-1. What is the minimum radius of the spherical shell required?




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The principle of Van de Graaf generator is that charge given to hollow conductor gets transferred and uniformly distributed to the outer surface.

You can see the figure and working in your notebook.