A cylinder of radius R and length L is placed in a uniform electric field E parallel to the axis of the cylinder. The total flux from the surface of cylinder is given by

The study of the effects associated with electric charges at rest is called 

The potential of a point A is -500 V and that of another point B is +500 V. The work done by an external agent to take 2 units of negative charge from B to A is

Capacitance (in F) of a spherical conductor with radius 1 m is

Two spheres of radii r₁ and r₂ are charged to the same potential. If s₁ and s₂ are surface densities of charges on the two, then ratio  is

A 100 μF capacitor is charged to a potential difference of 50 V, the charging battery then being disconnected. The capacitor is then connected to a second capacitor. If the measured potential difference drops to 35 V, the capacitance of the second capacitor is

On moving a charge of 20 coulomb by 2cm, 2 J of work is done, then the potential difference between the points is

Electric potential of earth is taken to be zero because earth is a good

A capacitor of capacitance 2 μF is charged to a potential difference of 200 volts. After disconnecting from the battery, it is connected in parallel with another uncharged capacitor. The common potential is 40 volts. The capacitance of the second capacitor is 

Two spherical conductors A and B of radii 1mm and 2mm are separated by a distance of 5 cm and are uniformly charged. If the spheres are connected by a conducting wire then the equilibrium condition, the ratio of the magnitude of the electric fields at the surfaces of spheres A and B is