Two point charges +q and -q are placed d distance apart. What is the zero potential plane for them?

Two point charges +q_1 and +q_2 are placed a finite distance 'd' apart. It is desired to put a third charge q_3 in between these two charges so that q_3 is in equilibrium. This is

Two point charges +4 esu and +9 esu are placed 10 cm apart. At what point on the line joining them will a unit positive charge experience (i) an equal but opposite and (ii) an equal and unidirectional force?

Two point charges +4q and +q are placed 30 cm apart. The electric field intensity at a point on the line joining the two charges is zero. The point is situated at a distance

Two point charges each of magnitude +q are placed at a distance r from each other. Draw the lines of force in this case.

Three charges -q, Q and -q are placed at equal distances on a straight line. If the total potential energy of the system is zero, then what is the ratio q/Q ?

Two point charges e_(1) and e_(2) are placed at a distance d from each other. In between them there is no point where electric field is zero. From this what conclusion can you draw ?

Two point charges q_A=3muC and q_B=-3muC are located 20 cm apart in vacuum. What is the electric field at the midpoint of the line AB joining the two charges ?

Two charges +q and -q are placed at a distance d form each other . At which points the direction of the resultant electric field is parallel to the line joining the two charges ?