# Questions tagged [coulombs-law]

A fundamental and empirical law quantifying the electrostatic force between two charges.

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### Is there any role of permittivity of medium in finding electrostatic force between two charges in that medium in CGS system?

like from coulombs law,we know electrostatic force, $F=\frac{Qq}{4πεr^2}$ .....in SI System But in CGS this whole term $\frac{1}{4πε}$ got replaced by 1.,i just want to know like in SI, for different ...
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### How to (derivate and) apply the electric field formula? [closed]

this question might be straightforward but I'm getting lost and I feel like I wouldn't be able to proceed if I don't get this clear from the get-go. I get the basic idea behind finding the electric ...
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### Confusion In Derivative of Electrostatic Potential Energy Of 2 Charge System

In my textbook, the derivative shows a -ve sign in front of the integral. My confusion is why is that -ve sign there? Isn't the direction of external force and displacement the same and hence shouldn'...
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