(B) $J$.$J$. Thomson determined the specific charge $(e/m)$ of an electron using his cathode ray tube experiment. Later,Robert $A$. Millikan determine

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(B) $J$.$J$. Thomson determined the specific charge $(e/m)$ of an electron using his cathode ray tube experiment. Later,Robert $A$. Millikan determined the charge $(e)$ of an electron using his oil-drop experiment. By combining these two values,the mass $(m)$ of the electron was evaluated indirectly as $m = e / (e/m)$.