" The strong electro static force of attraction formed between two oppositely charged ions is known "

The force of attraction between two charged bodies depend on

An electrostatic force of attraction between two point charges A and B is 1000 N.If the charge on A is increased by 25% and that on B is reduced by 25% and the initial distance them is decreased by 25% , find the new force of attraction between them.

What is the percentage change in distance if the force of attraction between two point charges increases to 4 times keeping magnitude of charges constant ?

In ionic solids, the oppositely charged ions are closely packed in space and have strong electrostatic forces of attraction. These compound have high melting and boiling points and are poor conductors of electricity in the solid state. (i) Why are ionic solids poor conductros of electricity ? (ii) What happens to electrical conductivity when these are dissolved in water ?