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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