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 hollowing metallic sphere of radius 10cm is charged such that potential on its surface is 80V. the potential at the center of the sphere would be.

A hollow metal sphere of radius 5 cm is charged such that the potential on its surface to 10V. The potential at the centre of the sphere is ......(a)zero (b)10V (c)the same as that at a point 5 cm away from the surface (d)the same so that at a point 25 cm away from the surface

A regular pentagon is drawn with vertices on a circle of radiús 15 centimetres. Calculate the length of its sides.