Question

What will be the charges on silk and glass rods when they are rubbed against each other?

Answer 1

1. When a glass rod is rubbed with a silk piece, the free electrons in the glass rod are transferred to the silk piece.
2. It is because the free electrons in the glass rod are tightly bound as compared to that in the silk piece.
3. Since the glass rod loses electrons, it has a deficiency of electrons and hence acquires a positive charge.
4. But, the silk piece has an excess of electrons.
5. So, it becomes negatively charged.