Electrostatics ...

Two spheres A and B of radius 4 cm and 6 cm are given charges of 80 µc and 40 µc respectively. If they are connected by a fine wire, the amount of charge flowing from one to the other is

In identical mercury droplets charged to the same potential V coalesce to form a single bigger drop. The potential of new drop will be

An uncharged sphere of metal is placed in between two charged plates as shown. The lines of force look like

The intensity of the electric field required to keep a water drop of radius 10^–5 cm just suspended in air when charged with one electron is approximately (g = 10 newton / kg, e = 1.6 × 10^–19 coulomb)

Three particles, each having a charge of 10 µC are placed at the corners of an equilateral triangle of side 10 cm. The electrostatic potential energy of the system is

The electric field near a conducting surface having a uniform surface charge density σ is given by

There is an electric field E in X-direction. If the work done on moving a charge 0.2 C through a distance of 2 m along a line making an angle 60° with the X-axis is 4.0, what is the value of E?

Four equal charges Q are placed at the four corners of a square of each side is \'a\'. Work done in removing a charge –Q from its centre to infinity is