Two metal spheres, one of radius R and the other of radius 2 R respectively have the same surface charge density `sigma`. They are brought in contact and separated. What will be the new surface charge densities on them?

If 'R' is radius of a sphere and Q is charge supplied to it, then the surface charge density (sigma) is given by

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

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

Electric field intensity at a point in between two parallel sheets with like charges of same surface charge densities (sigma) is

A conducting sphere of radius 10 cm is charged to 10 muC . Another uncharged sphere of radius 20 cm is allowed to touch it for some time. After that, if the spheres are separated , then surface density of charges on the spheres will be in the ratio of

Linear charge density for a circle of radius r is

If R is the radius of the earth and g the acceleration due to gravity on the earth's surface, the mean density of the earth is

Consider two conducting spheres of radii R_1 and R_2 with R_1 > R_2 . If the two are at the same potential, the larger sphere has more charge than the smaller sphere. State whether the charge, density of the smaller sphere is more or less than that of the larger one.

The escape velocity from the surface of the earth of radius R and density rho