Two negative point charges each of magnitude `8xx10^(-8)C` and another positive charge Q are placed on the same straight line. At what position and for what value of Q, the system will remain in equilibrium?

Two negative charges each of 1 unit and a positive charge q are placed along a straight line. Find the magnitude and position of q for which all the chargews will remain at equilibrium? Is the equilibrium stable, unstable or neutral in this case?

Two negative point charges each of magnitude 2 esu and another point charge q are lying on a straight line. Each of the charges are in equilibrium. Determine the position, value and the nature of the charge q.

Two negative charges each of 1 unit and a positive charge q are placed on a straight line. Where should the charge q be placed and what should be its value for equilibrium of the charges? Is this equilibrium stable, unstable or neutral ?

A charge q is placed at the centre of the line joining tow equal charges Q. For what value of q will the system of the three charges be in equalilibrium ?

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

Two equal point charges are placed on x=-a and x=+a on the x=axis. Another point charge Q is placed on the origin. IF this charge is displaced a small distance x along x-axis, then the change of potential energy approximately will be proportional to

Three point charges q , 2q and 8q are to be placed on a 0.09m long straight line. Find the positions of the charges so that the potential energy of this system becomes minimum. In this situation, find the intensity at the position of the charge q due to the other two charges?