The sides of a rectangel ABCD are 15cm & 5cm as shown in figure point charge ` -5muc` and `+2muc` are placed at the corner D and B respectively. Calculate the electric potential at A & C.

Two charges of 5 * 10^-6 C and -5 * 10^-6 C are placed 5 cm apart, at points A and B respectively. Find the electric field at C, 5 cm away from both A and B.

ABCD is a square of side 20 cm positive charges of +2 * 10^-9 C. +4 * 10^-9 C and + 8 * 10^-9 C are placed at the corners A, B and C respectively. Calculate the work required to be done to transfer a unit positive charge from D to the point of intersection of the diagonals.

Three charges, each equal to 16 * 10^-9 C are placed at the three corners of a square of side 4 cm. Find the electric field at fourth corner.

An electric dipole is formed by + 4muC and - 4muC charges at 5 mm distance. Calculate the dipole moment.

Two charges each of magnitude 4muC are placed at two corners of an equilateral triangle of side 4m. Find the magnitude of electric field at the third corner.

In Fig 13,ABCD is a square of side 5.6 cm.As shown in the figure,four circles are drawn with centres A,B,C and D respectively.Find the area of the shaded region in the diagram. (pi=22/7)

Two point charge +16muC and -9muC are placed at 8 cm apart in air. Determine the position of the point at which the resultant electric field is zero.