Two point charges `q_1` and `q_2` are kept at a distance of `r_(12)` in air. Deduce the expression for the electrostatic potential energy of the system.

Two point charges 4Q and Q are separated by a distance of 1 m in air. Also calculate the electrostatic potential energy of the system of two charges, taking Q = 2 xx 10^-7C .

Two points charges +10muC and -10muC are separated by a distance of 40 cm in air. Calculate the electrostatic potential energy of the system, assuming the zero of the potential energy to be at infinity.

Two points charges q_1 = 10 xx 10^-8 c and q_2 = -2 xx 10^-8 C are separated by a distance of 60cm in air. Also calulate the electrostatic potential energy of the system.

Two point charges q1 and q2 are kept at a distance of r12 in air..If an external electric field is applied on the system, write the expression for the total energy of this system.

When the separation between two charges is increased, the electric potential energy of the system

Two point charges 4 mu C and -2 muC are separated by a distance of 1 m in air. At what point on the line joining the charge is electric potential zero?

Two point charges +Q_1 and Q_2 are placed r distance apart. Obtain the expression for the amount of work done to place a third charge Q_3 at the midpoint of the line joining the two charges.

Four point charges Q, q, Q and q are placed at the corners of a square of side 'a' as shown in the figure. Find the potential energy of this system?