Electrostatics ...

A battery is used to charge a parallel plate capacitor till the potential difference between the plates becomes equal to the electromotive force of the battery. The ratio of the energy stored in the capacitor and work done by the battery will be

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

The following arrangement consists of five identical metal plates marked 1, 2, 3, 4 and 5 parallel to each other. Area of each plate is A and separation between the successive plates is d. The capacitance between P and Q is

A parrallel plate capacitor of capacitance 5F and plate separation 6 cm is connected to a1 V battery and charged. A dielectric of dielectric constant 4 and thickness 4 cm is introduced between the plates of the capacitor. The additional charge that flows into the capacitor from the battery is

For circuit the equivalent capacitance between points P and Q is

Four identical capacitors are connected in series with a 10 V battery as shown in the figure. Potentials at A and B are

64 identical drops of mercury are charged simultaneously to the same potential of 10 volt. Assuming the drops to be spherical, if all the charged drops are made to combine to form one large drop, then its potential will be

Two metal plate form a parallel plate capacitor. The distance between the plates is d. A metal sheet of thickness d/2 and of the same area is introduced between the plates. What is the ratio of the capacitance in the two cases ?

Two parallel conducting plates of area A = 25m² each are placed 6 mm apart and are both earthed. A third plate, identical with the first two, is placed at a distance of 2 mm from one of the earthed plates and is given a charged of 1 C. The potencial of the central plate is