PHYSICS · Single correct · CBSE · Physics · Electric Charges and Fields · Electric Charges and Fields
Problem
After a plastic ruler is rubbed with a wool cloth, the ruler becomes negatively charged. Which of the following best explains the sign of the ruler’s charge?
(a) Protons are transferred from the wool to the ruler because protons can migrate through materials when rubbed.
(b) Electrons are transferred from the ruler to the wool because the electrons in the plastic are less tightly bound than those in wool.
(c) Electrons are transferred from the wool to the ruler because the electrons in the wool are less tightly bound.
(d) Electrons are transferred from the wool to the ruler because plastic has a lower electron affinity than wool.