Find the point in between two charges where the net potential is zero.

Two charges 3 xx 10^(-8)C and -2 xx 10^(-8)C are located 15cm apart. At what point on the line joining the two charges is the electrical potential zero? (Take, the potential at infinity to be zero)

Is there a point in an electric field where electric potential is zero but not the electric field intensity ?

A point charge Q is placed at the midpoint of a linejoining two charges, 4q and q if the net force on charge q is zero, the Q must be equal to :