Charge question made me shut !!!

Zubeen

Quote by DaleSpam

The modern definition is the one I described in post 5. That definition is sufficiently precise that the theory based on it can accurately predict and account for all observed behaviors of charge and EM interactions. So, no more precise definition will be needed until some new observations are discovered which are not accounted for by the current definition.

OK so what observations led to the development of formula of E=mc^2 ?
Actually, about this formula, I've heard that there's no derivation for it.
Einstein just himself suggested this formula and later on the formula was found to be experimentally correct !!!!!!
is it all true ?

PhilDSP

Quote by Zubeen

So does that means that there are chances of further development of electrodynamics ??

Yes, but it seems to be a difficult area to get experimental information on. Theoretically, the Dirac equation for the electron predicts that its charge travels within a very small region at the speed of light (Zitterbewegung). That means it's decoupled from the position of the center of mass of an electron. The Dirac equation makes some extremely accurate predictions but of course no theoretical model matches all results and is perfectly consistent with all theoretical principles.

DaleSpam

Quote by Zubeen

OK so what observations led to the development of formula of E=mc^2 ?

All relativistic formulas, including E=mc^2, can be traced to two key postulates:
1) the principle of relativity
2) the invariance of the speed of light

http://en.wikipedia.org/wiki/Postula...ial_relativity

Quote by Zubeen

Actually, about this formula, I've heard that there's no derivation for it.
Einstein just himself suggested this formula and later on the formula was found to be experimentally correct !!!!!!
is it all true ?

No. There are many derivations.

epenguin

We don't know how old your sister is but a demonstration involving a comb and your sister's hair or, if it will be more co-operative, a cat, could possibly help make the point well.

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epenguin Recognitions: Gold Member	We don't know how old your sister is but a demonstration involving a comb and your sister's hair or, if it will be more co-operative, a cat, could possibly help make the point well.