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

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

Similar Questions

In Thomson experiment of finding $e/m$ for electrons, beam of electron is replaced by that of muons (particle with same charge as of electrons but mass $208$ times that of electrons). No deflection condition in this case satisfied if

Particle nature and wave nature of electromagnetic waves and electrons can be shown by

  • [AIIMS 2000]

An electron beam is moving between two parallel plates having electric field $1.125 \times {10^{ - 6}}N/m$. A magnetic field $3 \times {10^{ - 10}}T$ is also applied so that beam of electrons do not deflect. The velocity of the electron is ............ $m/s$

Write and explain methods to obtain emission of electron from metal.

Which of the following law is used in the Millikan's method for the determination of charge