An electron initially at rest, is accelerated through a potential difference of 200 volt, so tha...

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An electron initially at rest, is accelerated through a potential difference of 200 volt, so that it acquires a velocity \( 8.4 \times 10^{6} \mathrm{~m} / \mathrm{s} \). The value of \( e / m \) of electron will be
(A) \( 2.76 \times 10^{12} \mathrm{C} / \mathrm{kg} \)
(B) \( 1.76 \times 10^{11} \mathrm{C} / \mathrm{kg} \)
(C) \( 0.76 \times 10^{12} \mathrm{C} / \mathrm{kg} \)
(D) None of these
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