Electrostatics ...

A force F acts between sodium and chlorine ions of salt (sodium chloride) when put 1 cm apart in air. The permittivity of air and dielectric constant of water are ɛ₀ and K respectively. When a piece of salt is put in water electrical force acting between sodium and chlorine ions 1 cm apart is

Two similar spheres having +q and –q charge are kept at a certain distance. F force acts between the two. If in the middle of two spheres, another similar sphere having +q charge is kept, then it experience a force in magnitude and direction as

When air is replaced by a dielectric medium of constant k, the maximum force of attraction between two charges separated by a distance

A glass rod rubbed with silk is used to charge a gold leaf electroscope and the leaves are observed to diverge. The electroscope thus charged is exposed to X-rays for a short period. Then

One metallic sphere A is given positive charge whereas another identical metallic sphere B of exactly same mass as of A is given equal amount of negative charge.Then

The force between two charges 0.06m apart is 5 N. If each charge is moved towards the other by 0.01m, then the force between them will become

Two charged spheres separated at a distance d exert a force F on each other. If they are immersed in a liquid of dielectric constant 2, then what is the force (if all conditions are same)?

Two point charges +3 µC and +8 µC repel each other with a force 40 N. If a charge of –5 µC is added to each of them, then the force between them will become

When 10¹⁹ electrons are removed from a neutral metal plate, the electric charge on it is

Electric charges of 1 µC, –1µC and 2µC are placed in air at the corners A, B and C respectively of an equilateral triangle ABC having length each side 10 cm. The resultant force on the charge at C is