Answer :

e/m or the specific charge is a important ratio as it is found in basic equations of electro-magnetism, for instance,

evB = mv2/r …(1)


(e/m)vB = v2/r


v = Br(e/m)


eV = 1/2mv2 …(2)


v =


We see that the ratio (e/m) has an impact on the dynamics of electron in magnetic field hence e/m is given more importance that e or m.


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