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 .
(a) resultnat electric force on a charge Q and .
(b) potential energy of this system.

A point charge Q is placed at the corner of a square of side a. Find the flux through the square.

Charges +q and -q are located at the corners of a cube of side as show in the figure. Find the work done to separate the charges to infinite distance

Four charges of +q, +q, +q and +q are placed at the corners A, B, C and D of a square of side a. Find the resultant force on the charge at D

Four point charges +q,+q,-q and -q are placed on the corners of a square of side length 'a' as shown in the figure. The magnitude of electric field at a point which is at a distance x (gt gt a) from the centre along a line perpendicular to the plane of the square and passing through the centre is

Point charges each of magnitude Q are placed at three corners of a square as shown in the diagram. What is the direction of the resultant electric field at the fourth corner ?

Four charge Q, q, Q and q are kept at the four corners of a square as shown below. What is the relation between Q and q, so that the net force on a charge q is zero ?

(a) Three point charges q,-4q and 2q are placed at the vertices of an equilateral triangle ABC of side 'l' as shown in the figure. Obtain the expression for the magnitude of the resultant electric force acting on the charge q. (b) Find out the amount of the work 4one to separate the charges at infinite distance.

Four identical point charges q are placed at four corners of a square of side a. Find the potential energy of the charge system. .

Four electric charges +q, +q, -q and -q are placed at the corners of a square of side 2L (see figure). The electric potential at point A , mid-way between the two charges +q and +q , is

Charges q, 2q,3q and 4q are placed at the corners A,B,C and D of a square as shown in the following figure. The directon of electric field at the centre of the square is along