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Cottrell precipitator acts on which of the following principle?

a) Hardy-Schulze rule
b) Distribution law
c) Le Chatelier's priciple
d) Neutralization of charge on the colloid particles
(Please provide proper explanation for the appropriate answer.)


Cottrell precipitator =>
A machine for removing dusts and mists from gases , in which the gases passes through a grounded pipe with a fine axial wire at a high negative voltage , and particles are ionized by the corona discharge of the wire and migrate to the pipe.
so the correct option is 
d) Neutralization of charge on the colloid particles.
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