A beam of cathode rays is subjected to crossed electric $(E)$ and magnetic fields $(B).$ The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by (where $V$ potential diffrence between kethod and anode)

  • [AIPMT 2010]
  • A

    $\frac{{{B^2}}}{{2V{E^2}}}$

  • B

    $\;\frac{{2V{B^2}}}{{{E^2}}}$

  • C

    $\;\frac{{2V{E^2}}}{{{B^2}}}$

  • D

    $\frac{{{E^2}}}{{2V{B^2}}}$

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