Determine the electrostatic potential energy of a system consisting of two charges `7muC` and `-2muC` (and with no external field) placed at `(-9cm,0,0)` and (9 cm, 0,0) respectively.

Determine the electrostatic potential energy of a system consisting of two charges, 7 muC and -2 mu C (and with no external field) placed at (-9,0,0) cm and (9,0,0) cm respectively.

two charges 7 μ C and − 2 μ C (and with no external field) placed at ( − 9 c m , 0 , 0 ) and (9 cm, 0,0) respectively.How much work is required to separate the two charges infinitely away from each other ?

Calculate the potential at a point P due to a charge of 4times10^(-7) C located 9 cm away.

A wire, kept between two bridges 25 cm apart, is stretched through a linear expansion of 0.04 cm . Find the fundamental frequency of vibration of the wire. Given, the density and the Young's modulus of the material of the wire are 10 g*cm^(-3) and 9xx 10^(11) dyn * cm^(-2) , respectively.

Determine the length of the line joining between two points (-7,0) and (-2,0)

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?

The electrostatic force on a small sphere of charge 0.4muC due to another small sphere of charge -0.8muC in air is 0.2N What is the distance between the two spheres ?