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) $q V=\frac{1}{2} m v^{2}$

$\Rightarrow 2 \times 10^{-6} \times V=\frac{1}{2} \times \frac{2}{1000} \times 10 \times 10$

$\therefore V=50 kV$