Which of the following best explains why rubbing two plastic rods together can leave…
PHYSICS · Single correct · CBSE · Physics · Electric Charges and Fields · Electric Charges and Fields
Problem
Which of the following best explains why rubbing two plastic rods together can leave each rod with excess charge distributed throughout its volume rather than solely on its surface?
(a) In an insulator, mobile electrons quickly migrate to the outer surface, leaving the interior electrically neutral.
(b) The frictional force forces charges to move outward to minimize potential energy, concentrating them on the surface.
(c) In an insulator, charge carriers are fixed in place, so any transferred charge remains where it is created within the material.
(d) Plastic has free electrons like a metal, so charges spread uniformly by repulsion until the internal field becomes zero.