The fact that electric charges are integral multiples of the fundamental electronic charge was proved experimentally by

$A$ positively charged glass rod is brought near an uncharged metal sphere,which is mounted on an insulated stand. If the glass rod is removed,what is the net charge on the metal sphere?

The magnetic field vector component is due to ...... and the electric field scalar component is due to ......

Two identical conducting balls $A$ and $B$ have positive charges $q_{1}$ and $q_{2}$ respectively,where $q_{1} \neq q_{2}$. The balls are brought together so that they touch each other and then separated to their original positions. The force between them is

How are conductors and non-conductors different? Why are they not charged by rubbing them with our hands?

For what type of charge distribution,electric field can be obtained by using Coulomb's law and superposition principle?