Question

A bullet of mass $2g$. is having a charge of $2\mu C$. Through what potential difference must it be accelerated, starting from rest, to acquire a speed of $10m/s$?

• A. $5MV$
• B. $5V$
• C. $50V$
• D. $5kV$

Answer 1

The correct option is A $5MV$

Here change in kinetic energy $=$ work done $=$ potential energy

or $\frac{1}{2}m{v}^2=q{V}_{ac}$

or $V_{ac}=\frac{m{v}^2}{2q}=\frac{(2\times {10}^{-3})\times {10}^2}{2\times (2\times {10}^{-6})}=5MV$