A spherical conductor of radius 12cm has a charge of `1.6x10^(-7)` C distributed uniformly on its surface. What is the electric field a) Inside the sphere. b) Just outside the sphere. c) At point 18cm from the centre of the sphere?

A wire is bent in a circle of radius 10cm. It is given a charge of 250µC which spreads on it uniformly. What is the electric potential at the centre?

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.

Two point charges of 2 xx 10^(-7)C are 1.0 cm apart. What is the magnitude of the field produced by either charge at the side of the other?

A spherical charged conductor has sigma as the surface charge density. The electricfield on its surface is E. The radius of the sphere is doubled keeping the surface charge density unchanged. Then the electric field on the surface of the new sphere is,

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