An electron initially at rest, is accelerated through a potential difference of 200 volt, so that it acquires a velocity \[8.4\times {{10}^{6}}m/s.\] The value of e/m of electron will be [DPMT 2003]

• A.   \[2.76\times {{10}^{12}}C/kg\]    
• B.   \[1.76\times {{10}^{11}}C/kg\]    
• C.   \[0.76\times {{10}^{12}}C/kg\]    
• D.   None of these