When a glass rod is rubbed with silk,it

What is a point charge?

Which of the following electric charges is not possible?

What is the total charge of the electrons in a neutral atom?

Two identical spherical conductors $B$ and $C$ have equal radii and carry equal charges. They repel each other with a force $F$ when placed at a certain distance apart. $A$ third identical spherical conductor $A$,which is uncharged,is brought in contact with $B$ and then removed. It is then brought in contact with $C$ and removed. What is the new force of repulsion between $B$ and $C$?

What is electrostatic induction?