Electrostatic Potential and Capacitance - Result Question 19
21. A bullet of mass $2 g$ is having a charge of $2 \mu C$. Through what potential difference must it be accelerated, starting from rest, to acquire a speed of $10 m / s$ ?
[2004]
(a) $50 V$
(b) $5 kV$
(c) $50 kV$
(d) $5 V$
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Answer:
Correct Answer: 21. (c)
Solution:
(c) $q V=\frac{1}{2} m v^{2}$
$\Rightarrow 2 \times 10^{-6} \times V=\frac{1}{2} \times \frac{2}{1000} \times 10 \times 10$
$\therefore V=50 kV$
