When a glass rod is rubbed with a silk cloth then due to friction it acquire charge it acquire positive charge because of static electricity produced when rubbing with silk clothTHIS IS CALLED STATIC ELECTRICITY

Glass rod:
A glass rod is a solid, cylindrical piece of glass that is commonly used in scientific experiments and demonstrations. It is known for its transparency and ability to conduct electricity.

Acquiring positive charge:
When a glass rod is rubbed with a silk cloth, it acquires a positive charge. This phenomenon is a result of the transfer of electrons between the two materials.

Explanation:
- When the glass rod is rubbed against the silk cloth, the electrons from the glass rod are transferred to the silk cloth.
- This transfer of electrons leaves the glass rod with a deficiency of electrons, giving it a positive charge.
- The silk cloth, on the other hand, gains extra electrons from the glass rod, acquiring a negative charge.

Why does it happen:
The reason behind this transfer of electrons is the difference in the materials' electron affinity. Glass has a lower electron affinity compared to silk, which means it is more willing to give up its electrons. As a result, the glass rod becomes positively charged after rubbing against the silk cloth.
In conclusion, the process of acquiring a positive charge when a glass rod is rubbed with a silk cloth is due to the transfer of electrons between the two materials. This transfer occurs because of the difference in their electron affinities, leading to the glass rod becoming positively charged.