A charged belt 60 cm wide, travels at `20 ms^(-1)` between a source of charge and a sphere. The belt carries charges into the sphere at a rate corresponding to `120 mu A`. Calculate the surface charge density of the belt.

Asphere of radius 10 cm is given a charge of 20 muC on its surface. The surface charge density of sphere is

To what potential, must we charge an insulated sphere of radius 14 cm so that its surface charge density of 1 muC m^(-2) ?

Two charged sphere of radii R_1 and R_2 have equal surface charge density. The ratio of their potential is

A uniformly charged conducting sphere of 2.5 m in diameter has a surface charge density of 100 muC/m^2 . Calculate the charge on the sphere.

A sphere has surface charge density sigma . It is surrounded by a spherical shell. The surface charge density on the spherical shell is

Two insulated charges conducting spheres of radii 20 cm and 15 cm respectively and having an equal charge of 10 mu C are connected by a copper wire and then they are separated . Then (1) Both spheres will have equal charges. (2) Surface charges density on the 20 cm sphere will be greater than that on the 15 cm sphere (3) Surface charge density on the 15 cm sphere will greater than that on the 20 cm sphere (4) Surface charge density on the two spheres will be equal.