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`?

Set up an arrangement of three point charges +q, +2q, and +2xq separated by equal finite distances so that electric potential energy of the system is zero. Find the value of x.

Under what condition, is the potential energy of two point charges zero?

Two charges +q and -q are situated at a certain distance. At the point exactly midway between them,

What is the potential energy of the equal positive point charges of 1muC each, held 2m apart in air-

A charge q is placed at the centre of the line joining two equal charges Q. the system of the three charges will be in equilibrium if q is equal to

If the charges +Q and -Q are placed at the two vertices of an equilateral triangle of side l, then potential at the third vertex is

Three charges 4q , Q and q are in a straight line in the position 0, l/2 and l respectively. The resultant force on q will be zero if Q is equal to

Three charges, q each, are placed at the vertices of an equilateral triangle. What will be the resultant force on charges Q placed at the centroid of the triangle?

A charge q is at a distance r in an external electric field. Write an expression for potential energy of the charge.

Two unlike charges of magnitude q are separated by a distance 4d. The potential at a point midway between them is