A hexagon of side 0.1 m has a charge `10 mu C` at each of its vertices. Calculate the electric potential at the centre of the hexagon.

A regular hexagon of side 10 cm has a charge 5 muC at each of its vertices. Calculate the potential at the centre of the hexagon.

A cube of side b has a charge q at each of its vertices. Determine the potential and electric field due to this charge array at the centre of the cube.

A metal wire is bent into a circle of radius 10 cm. It is given a charge of 200 muC , which spreads on it uniformly, Calculate the electric potential at its centre.

A charge of 4xx10^-9 C is distributed uniformly over the circumference of a conducting ring of radius 0.3 m. Calculate the field intensity at a point on the axis of the ring at 0.4 m from its centre. Also, calculate the electri field at the centre of the ring.

A hollow metallic sphere of radius 10 cm is charged, such that potential of its surface is 70 V. The potential at the centre of the sphere would be

Four point charges 16muC, - 16muC, 16muC and -16muC are located at the corners of a square of each side 10 cm. Find the vlaue of electric field intensity and electric potential at the centre of the square.

Five point charges, each having a charge q are placed on the five croners A,B,C, D and E of a regular hexagon ABCDEF having each side of length a. Find the electric field at the centre of the hexagon.

A hollow metal sphere of radius 5 cm is charged, such that the potential on its surfae is 10 V. The potential at the centre of the sphere is

Assume that earth has a charge of surface density 1 electron per metre^2 . Calculate the earth's electric potential just outside the earth's surface.