• question_answer In bringing an $\alpha$ particle from rest from a position where electric potential is 70 volt to another position where the potential is 50 volt, the K.E. will be: A)  $40eV$                             B)  $40keV$           C)         $40MeV$         D)         $0eV$

Work done in carrying an $\alpha$ particle $W=q\times ({{V}_{2}}-{{V}_{1}})$ $=2e\times (70-50)=40eV$