1. Dec 8, 2015

### shio

Coulomb experiment torsion balance.

I know that electrical force is inversely to the square of the separation r ...My question is why we take r square? why we need square? And another question, why Q1Q2(multiplication of charges) is proportional to electrical force? (why we need to multiply them?) I know it sounds like silly question..but I really want to know (my teacher didn't tell me anything .he told me "just remember the formular" )

Last edited: Dec 8, 2015
2. Dec 8, 2015