When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain how this observation is consistent with the law of conservation of charge.

Answer

B

Explanation

According to the law of conservation of charge, "charge can neither be created nor be destroyed but can be transferred from one body to another body".
Before rubbing the two bodies they both are neutral i.e, the total charge of the system is zero. When the glass rod is rubbed with a silk cloth, the charge appears on both glass rod and the silk cloth. Some electrons from glass rod goes to silk cloth and glass rod attains positive charge (due to loss of electrons) and silk cloth attains same negative charge (due to gain of electrons)
Again the total charge of the system is zero i.e., the charge before rubbing is same as the charge after rubbing. This is consistent with the law of conservation of charge. Here, we can also say that charges can be created only in equal and unlike pairs.