Three charges -q,+2q, and -q are arranged on a line as shown in fig. Calculate the field at a distance rgtgta on the line.

Three charges +q, +q, +2q are arranged as shown in figure. What is the field at point P (center of side AC)

Three charges -q, +q and -q are placed along a st. line at equal distance , say a. Calculated the potential energy of this system of charges (i) when +q charge is in the middle and (ii) when this charge is at one end.

Three charges -q,+Q and -q are placed in a straight line as shown If the total potential energy of the system is zero, then the ratio (q)/(Q) is

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 ?

Three points charges =q, -2q, +q are arranged on the vertices of an equilaterial triangle as shown in the figure. Find he dipole moment of the system.

Three charges -q, Q and -q are placed at equal distances on a striaght line. If the potential energy of the system of three charges is zero, then what is the ratio of Q:q?

A right isosceles triangle of side a has changes q, 3q and - q arranged on its verticals as shown in the figure. What is the electric potential at P midway between the line connecting the + q and – q charges ?

Three charges -q, +Qand -q are placed at equal distance on straight line If the potential energy of the system of the three charges is zero, then what is the ratio of Q : q ?

Three charged paricles are placed on a straight line as shown in fig. q_(1) and q_(2) are fixed but q_(3) can be moved. Under the action of the forces from q_(1),q_(2) and q_(3) is in equilbrium. What is the relation between q_(1) and q_(2) .