Question

what role does electrostatics play in Xerox copying machine?

Answer 1

A xerox copying machine is one of the many industrial applications of the forces of attraction between charged bodies.

Particles of black powder, called toner stick to a tiny carrier bead og the machine on account of electrostatic forces.
The negatively charged toner particles are attracted from carrier bead to a rotating drum where a positively charged image of the document being copied had formed. A charged sheet if paper then attracts the toner particles from the drum to itself. They are the fused in place to produce thee photo copy.

Answer 2

A xerox copying machine is one of the many industrial applications of the forces of attraction and repulsion between charged bodies.
The black powdered particles are called toner, they stick to a tiny carrier bead of the machine on the account of electrostatic forces.
The negatively charged toner particles are attracted from carrier bead to a rotating drum, where a positively charged image of document being copied has formed.
A CHARGED SHEET OF PAPER THEN ATTRACTS THE TONER PARTICLES FROM THE DRUM TO ITSELF. 
THEY ARE THEN HEAT FUSED IN PLACE TO PRODUCE THE PHOTOCOPY.

hope it helps!!