VAN DE GRAAFF GENERATOR

Van de graff generator

Read the paragraph below and fill in the missing words.

Van de graff generator is used for building up potential difference of a few million volts, and fields close to the field of air which is about 3 × 10 6 V/m.

This large electric field due to high potential is used to charged particles

Enable JavaScript

Parts of Van de Graff Generator

There are two metallic brushes, one of it sprays charge from the source to lower part of the belt and the other connected to the large shell, which transfers the charge to the shell

There is a long narrow endless belt material, like rubber or silk, is wound around two pulleys – one at level, one at the of the shell, which continuously carries positive charge.

Enable JavaScript

Principle of Van de Graff Generator

Consider a small conducting sphere (radius r) inside a large spherical conducting shell of radius R. Two spheres are given positive charge

If small and large spheres carry positive charges q and Q respectively

Potential at the surface of the large sphere V(R) = Potential at +Potential at

Potential at the surface of the small sphere V(r) = Potential at + Potential at

V(r) - V(R) is always , irrespective of the

Enable JavaScript

Licensed under the Creative Commons Attribution Share Alike License 4.0