Question

what is this in coulomb law

Answer 1

r^ refers to unit vector along the axis
its useful fr determining the vector form of coulomb's law.......

Answer 2

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The force between two small charged particles is directly proportional to the product of the charges and inversely proportional to the square of distance between them.

It also tells us that opposite charges attract and like charges repel.

The SI unit of charge is coulomb which is denoted by the letter C. We can define this unit of charge as follows : One coulomb is that quantity of electric charge which exerts a Force of

9 * 10^{9}9∗10

9

Newton on an equal charge placed at a distance of 1 metre from it.

The SI unit of charge 'coulomb' (C) is equivalent to the charge contained in

6.25 * 10^{18}6.25∗10

18

electrons.