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