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give reason 4 the movement of colloidal particles towards cathode in an electric field.

Because colloidal particles has some charge on them. This is also one of the reason for it's stability.

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And not all colloidal particles move towards the cathode in an electric field. It depends on the charge of the colloid.
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Colloidal particles which have a positive charge on them exhibit cataphoresis ie. movement of colloidal particles towards the cathode.
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