Robert Van de Graaff designed a machine which produces a large amount of electrostatic potential difference.
up to several million volts (107 V).
generator works on the principle of
electrostatic induction and action at points.
A large hollow spherical conductor is
fixed on the insulating stand.
A pulley B is mounted at the centre of the hollow sphere
pulley C is fixed at the bottom.
A belt made up of insulating materials like silk or rubber
The pulley C is driven continuously
Two comb shaped metallic conductors E
and D are fixed near the pulleys.
The comb D is maintained at a positive
potential of 104 V .
The positive charges are pushed towards the belt
negative charges are attracted towards the
comb D.
The positive charges stick to the
belt and move up.
When the positive charges
on the belt reach the point near the comb E,
the comb E acquires negative charge
and
the sphere acquires positive charge due
to electrostatic induction.
As a result, the positive charges are pushed away from the comb E .
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