The gravitational force between a hollow spherical shell (of radius R and uniform density) and a point mass is F. Show the nature of F vs r graph whee r is the distance of the point form the centre of the hollow spherical shell of uniform density.

A spherical conduting shell of inner radius r_1 and outer radius r_2 has a charge Q. A charge q is placed at the centre of the shell. Write the expression for the electric field at a point x > r_2 from the centre of the spherical shell.

A spherical shell of radius R has a charge +Q units. The electric field due to the shell at a point

The gravitational force between a H-atom and another particle of mass m will be given by Newton's law: F=G(M.m)/r^2 , where r is in the km.

A sphere of charge of radius R has uniform volume charge density. The electric field due to the sphere of charge at a point

Force between two point electric charges kept at a distance of r in air is F. if these charges are kept at the same distance in water, how does the force between them change?

A thin metallic spherical shell of radius R carries a charge Q on its surface. A point charge Q/2 is placed at its centre C and another charge +2Q outside the shell at a distance r from the centre as shown in figure. Find the electric flux through the shell.

The electric field at a distance 3R/2 from the centre of a charge conducting spherical shell of radius R is E. The electric field at a distance R/2 from the centre of the sphere is

A spherical conducting shell of inner radius r_1 and outer radius r_2 has a charge Q. A charge q is placed at the centre of the shell. What is the surface charge density on the inner and outer surfaces of the shell?

A thin metallic spherical shell of radius R carries a charge Q on its surface. A point charge Q/2 is placed at its centre C and another charge +2Q outside the shell at a distance r from the centre as shown in figure. Find the force on the charge at the centre of shell and at point A.

A point charge +Q is placed at the center O of an uncharged hollow spherical conductor of inner radius 'a' and outer radius 'b'. Find the following: The magnitude of electric field vector at a distance (i) r=a/2 and (ii) r=2b from the centre of the shell.