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
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
- 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
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