Test: Electric Charges (NCERT)

The property which differentiates the two types of charges is called the polarity of charge.

When a glass rod is rubbed with silk cloth then some of the electrons from the glass rod get transferred to silk cloth and thus the glass rod gets positive charge and the silk gets negative charge. No new charge is created in the process of rubbing.

While combing hair, friction between the comb and the hair results is the transfer of electrons.

Object can be charged by rubbing. During rubbing some of the free electrons may get transferred from one object to other.

Charge on an electron was measured by Millikan with the help of the oil drop experiment.