My question relates to the third MIT's video lecture about Electricity and Magnetism, specifically from 21:18−22:00 : http://youtu.be/XaaP1bWFjDA?t=21m18s
I have watched the development of Gauss's law, but I still don't quite understand the link between Gauss's law and Coulomb law: How does Gauss's law change if Coulomb law would of been a different one.
I also don't understand why is it so important for Gauss's law that the electric field decrease proportionally to 1r2 ?
For example, what would of happened if the electric field decrease proportionally to 1r , or 1r3 ?
Answer
Gauss' law and Coulomb's law are equivalent - meaning that they are one and the same thing. Either one of them can be derived from the other. The rigorous derivations can be found in any of the electrodynamics textbooks, for eg., Jackson. For eg., consider a point charge q. As per Coulomb's law, the electric field produced by it is given by →E=kqr2ˆr
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