Electrostatics ...

Conductors are materials 

Four point charges + q, + q, – q and – q are respectively placed at corners A, B, C and D of a square of side a. The electric potential at the centre O of the square is

A glass slab is held within the plates of a charged parallel plate condenser. Which of the following quantities does not change?

A neutral hydrogen molecule has two protons and two electrons. If one of the electrons is removed, we get a hydrogen molecular ion (). In the ground state of , the two protons are separated roughly by 1.5  and the electron is roughly at 1  from each proton. What is the potential energy of the system?

A parallel plate air-filled capacitor has a capacitance of 2 . When it is half-filled with a dielectric of dielectric constant k = 3, its capacitance becomes

Charge is quantized means

A parallel plate capacitor has a voltage of 5 V between the two plates separated by 4 microns (1 micron = 10^-6 m). What is the electric field between the capacitor plates?

Two positive charges

A capacitor of capacitance C is fully charged by a 200 V supply. It is then discharged through a small coil of resistance wire embedded in a thermally insulated block of specific heat 2.5  10² J kg^–1 K^–1 and of mass 0.1 kg. If the temperature of the block rises by 0.4 K, then what is the value of C?

The following figure shows a network of capacitors, where the numbers indicate capacitances in microfarad. What must be the value of capacitance C, if the equivalent capacitance between points A and B is to be 1 ?

If a positive charge is shifted from a low potential region to a high potential region, then what will happen to its potential energy? 

A dielectric slab of thickness d is inserted in a parallel plate capacitor whose negative plate is at x = 0 and positive plate is at x = 3d. The slab is equidistant from the plates. The capacitor is given some charge. As x goes from 0 to 3d, so

The dielectric constant K of an insulator cannot be

A capacitor of capacitance 1 micro F is charged to 1 kV. What is the energy stored?

electrostatic force is 

The electric potential due to an extremely short dipole, at a distance r from it, is proportional to

The introduction of a metal plate between the plates of a parallel plate capacitor increases its capacitance by 4.5 times. If d is the separation of the two plates of the capacitor, then the thickness of the metal plate introduced is

The electrical conductivity of Earth's atmosphere increases with altitude because of

If n drops, each of capacitance C, coalesce to form a single big drop, the capacitance of the big drop will be

Ionization of a neutral atom is the