Question

the movement of colloidal particles under an applied electric potential is called

Answer 1

hey,

here is your answer,

(a) The phenomenon of movement of colloidal particles under an applied electric field is called electrophoresis. ... (f) The reverse of electrophoresis is called Sedimentation potential or Dorn effect. The sedimentation potential is setup when a particle is forced to move in a resting liquid.

Answer 2

The correct answer for your question is electrophoresis.  

The movement of colloidal particles under an applied potential is called electrophoresis.

In this process, when an electric charge is applied to the colloidal solution the positively the charged particles will move towards the cathode and the negatively charged particles will move towards the anode. The above phenomenon is known as electrophoresis.

This technique is commonly implemented to separate the charged particles in a colloidal solutions like protein.