In an electron gun, the electrons are accelerated by a potential $\mathrm{V}$. If $\mathrm{e}$ is the charge and $\mathrm{m}$ is the mass of an electron, then the maximum velocity of these electrons will be

• A

  $\frac{2\mathrm{eV}}{\mathrm{m}}$
• Correct answer
  B

  $\sqrt{\frac{2\mathrm{eV}}{\mathrm{m}}}$
• C

  $\sqrt{\frac{2\mathrm{m}}{\mathrm{eV}}}$
• D

  $\frac{{\mathrm{V}}^2}{2\mathrm{em}}$

Hence, the correct answer is option: 'B'.