Electrostatics ...

A charge Q is placed at the centre of the line joining two point charges + q and + q, (Fig). What is the ratio Q/q for the system to be in equilibrium?

A given charge situated at a certain distance from an electric dipole in the end on position, experiences a force F. If the distance of charge is doubled, the force acting on the charge will be

A charge q₁ exerts some force on a second charge q₂. If third charge q₃ is brought near, the force of q₁ exerted on q₂

Two charges q₁ and q₂ are distance a apart. If dielectric of thickness b and dielectric constant K is inserted in between the two charges, the force experienced would be

The surface density on the copper sphere is σ. The electric field strength on the surface of the sphere is

An electric field exists in the space around a point charge +Q. A positive charge +q is carried from A to B and A to C, where B and C lie on a circle with +Q at the centre (Fig.). Work done is

A uniform electric field having a magnitude E 0 and direction along the positive X -axis exists. If the potential V is zero at x = 0, then its value at x = + x will be

An electron of mass m and charge e is accelerated from rest through a potential difference V in vacuum. Its final speed will be

A spherical charged conductor has surface density of charge = σ , and electric field intensity on its surface is E. If radius of surface is doubled, keeping σ unchanged, what will be electric field intensity on the new sphere?

In a certain charge distribution, all points having zero potential can be joined by a circle S. Points inside S have negative potential. A positive charge, which is free to move, is placed inside S.