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Wave Optics
Question
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What is so special about the combination e/m? Why do we not simply talk of e and m separately?

Answer

Electric and magnetic field is related with basic equations like,  

       eV =1/2 mv2 or eE = ma and,
                    eBv = mv2/r

In all these equations, the dynamics of electrons is determined not by e and m separately but by the combination e/m. Hence, we do not talk of e and m seperately.

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