Two spheres `A` and `B` of radius 'a' and 'b' respectively are at same electric potential. The ratio of the surface charge densities of `A` and `B` is

Two spheres A and B of radius a and b respectively are at the same potential. The ratio of the surface charge density of A to B is

Two spheres of radius a and b respectively are charged and joined by a wire. The ratio of electric field of the spheres is

Two metal spheres A and B of different sizes are charged such that the electric potential is the same at the surface of each. Sphere A has a radius three times that of sphere B . If E_(A) and E_(B) be the electric field magnitudes at the surface of each sphere, then E_(B)//E_(A) is

two metal spheres of radii R_(1) and R_(2) are charged to the same potential. The ratio of charges on the spheres is

Two conducting concentric, hollow spheres A and B have radii a and b respectively, with A inside B. Their common potentials is V. A is now given some charge such that its potential becomes zero. The potential of B will now be

Spheres A and B have their radii 40 cm and 10 cm respectively. Ratio of surface area of A to the surface area of B is :

Two charged spherical conductors of radius R_1 and R_2 are connected by a wire. Then the ratio of surface charge densities of the spheres (sigma_1)/(sigma_2) is

The answer to each of the following questions is a single-digit integer ranging from 0 to 9. Darken the correct digit. There are two metallic spheres A and B of radii R and 3R respectively. Both the spheres are given charge so that they may attain the same potential. If E_(A) is the electric field on the surface of sphere A and E_(B) is the electric field intensity on the surface of sphere B then calculate E_(A)//E_(B) .

Two isolated charged conducting spheres of radii a and b produce the same electric field near their surface. The ratio of electric potentials on their surfaces is