Electrostatics ...

A charge Q is uniformly distributed over a long rod AB of length L as shown in the figure. The electric potential at the point 0 lying at distance L from the end A is

A point charge + q moves from points P to O along the path PQRO in a uniform electric field E. Find the work done by the field

This question has statement 1 and statement 2. Of the four choices given after the statements, choose the one that best describes the two statements.
An insulating solid sphere of radius R has a uniform positive charge density ρ. As a result of this uniform charge distribution, there is a finite value of electric potential at the centre of the sphere, at the surface of the sphere and also at a point outside the sphere. The electric potential at infinite is zero.

A charge +q is placed at the origin O of X–Y axis as shown in the figure. The work done in taking a charge Q from A to B along the straight line AB is

Identify the wrong statement.

Consider three concentric shells of metal A, B and C are having radii a, b and c respectively as shown in the figure (a < b < c). Their surface charge densities are σ, – σ and σ respectively. Calculate the electric potential on the surface of shell A

A small conducting sphere of radius r is lying concentrically inside a bigger hollow conducting sphere of radius R. The bigger and smaller spheres are charged with Q and q (Q > q) and are insulated from each other. The potential difference between the spheres will be

Figure shows three points A ,B and C in a region of uniform electric field E. The line AB is perpendicular and BC is parallel to the field lines. Then, which of the following holds good?
where, V_A ,V_B and V_C represent the electric potential at the points A ,B and C respectively.

Two thin wire rings each having a radius R are placed at a distance d apart with their axes coinciding. The charges on the two rings are + q and –q. The potential difference between the centres of the two rings is

Two point charges +4µC and + 2µC repel each other with a force of 8 N. If a charge of –4µC is added to each of these charges, the force would be