Question

When a glass rod is rubbed with silk cotton, then what kind of the electric charge produces on the glass rod ?

Answer 1

Learn about the charge, types of charges that are present learn about the conservation of charge. Conservation of charges states that the charge neither can be destroyed nor can be created.

Complete answer:
We know that conservation of charges states that the charge neither can be destroyed nor can be created; it can only be transferred from one body to another. So, the total charge in a system is always conserved. That means charge cannot be produced or destroyed by rubbing two objects.

When a glass rod is rubbed with silk the electrons gain energy and few of them escape the atom and get attracted by the other object. So, a net charge is said to be produced since the number of protons is not equal to the number of protons in the two bodies. Now, this net charge cannot leave the object since there is no source of medium anymore from which they can leave or more charge comes into the body.

The study of static charge is called the electrostatics.When the glass rod is rubbed with silk, glass tends to lose electrons rather easily and silk takes them away from the glass atoms.So, rubbing glass rod with silk cotton, the glass tends to become positively charged and the silk becomes negatively charged.

Note: Since glass rod and silk are not conductors, they are dielectric in nature- electrostatic charges do not leave the silk, or more charges do not come into the glass rod easily. With a gold leaf electroscope the type of charge in a body can be easily identified-whether it is negative or positive in nature.