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

  • A

    $\frac{{2eV}}{m}$

  • B

    $\sqrt {\frac{{2eV}}{m}} $

  • C

    $\sqrt {\frac{{2m}}{{eV}}} $

  • D

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

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