Two point electric charges of values q and 2q are kept at a distance d apart from each other in air. A third charge Q is to be kept along the same line in such a way that the net force acting on q and 2q is zero. Calculate the position of charge Q in terms of q and d.

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

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

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 ?

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 electric charges q and -2q are placed 6m apart on a horizontal plane. Find the locus of any point on this plane where the potential has a value zero.

Two point charges q_1 and q_2 are such that q_1q_2 lt 0 . What is the nature of the force acting between the two charges?

The points on the line joining two charges +q and 3q (kept at a distance of 1.0 m) where electric potential is zero.

Two charges, + q and -q are separated by a distance d. At which points will the resultant electric field intensity be directed parallel to the line joining the charges ?

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 identical thin rings, each of the radius R are coaxially placed at a distance R from each other. If Q_(1) and Q_(2) are the charges uniformly distributed on the rings, then calculate the work done in moving a charge q from the centre of one ring to the centre of the other.