Three point charges q, 2q and- 4q are in air at three points so-that the distance between any two charges is 10 cm. Calculate total potential energy of the system if q = `3xx10^2`esu.

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?

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_1 and q_2 are such that q_1q_2 lt 0 . What is the nature of the force acting between the two charges?

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

Two point charge q_(1) = 10 xx 10^(-8)C and q_(2) = -2 xx 10^(-8)C are separated by a distance of 6 cm in air. (ii) The electrostatic potential energy of the system is

Three point charges each equal to q are placed on the vertices of an equilateral triangle of side l. The potential energy of the system is

Four point charges -Q, -q, 2q and 2Q are placed, one at each comer of the square. The relation between Q and q for which the potential at the centre of the square is zero is.

Two (-ve) charge, each of magnitude q are situated at 2r distance apart. A (+ve) charge q is lying at the centre between them. The potential energy of the system is U_1 If the two nearest charges are mutually interchanged and the potential energy becomes U_2 then U_1/U_2 will be

Electric charge q, q and -2q are placed at the corners of an equilateral triangle ABC of side L. The magnitude of electric dipole moment of the system is