@ Pantpranv...i said the same thing quite earlier.......

and

Mr. Ultimator.....Laws are made on the basis of observations...from which some assumptions are made and formulated and then stated as the laws.......Mr. Coulomb did that and u read that in ur textbook.....

from what he did....I just interpreted it in another way that cud become the answer for above question.....

and thus if u wanna say that i m wrong.....then u mean Mr Coulomb is wrong.....and if u r saying this then their is no use for u in studying Physics....u make ur own Physics and do that.....ok......mind it.......