A point charge `Q` is placed at the centre of a circular wire of radius `R` having charge `q`. Find the force of electrostatic interaction between point charge and the wire.

A point charge Q is placed at the centre of circular disc of radius r . Calculate the electric flux associated with circular disc.

A point charge +Q is placed at the centre of an isolated conducting shell of radius R. Find the electrostatic potential energy stored outside the spherical shell if the shell also contains charge +Q distributed uniformly over it.

A point charge q is placed at a distance d from the centre of a circular disc of radius R. Find electric flux flowing through the disc due to that charge

A point charge q is placed at a distance d form the center of circular disc of radius R . Find electric flux through the disc due to that charge

A spherical conductor having charge q and radius r is placed at the centre of a spherical shell of radius R and having charge Q(R gt r0 . The potential difference between the two is

A spherical conductor having charge q and radius r is placed at the centre of a spherical shell of radius R and having charge Q (R gt r). The potential difference between the two is