In Milikan’s experiment, an oil drop having charge $q$ gets stationary on applying a potential difference $V$ in between two plates separated by a distance $‘d’$. The weight of the drop is
$qVd$
$q\frac{d}{V}$
$\frac{q}{{Vd}}$
$q\frac{V}{d}$
When the speed of electrons increases, then the value of its specific charge
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 ............ $m/s$
Particle nature and wave nature of electromagnetic waves and electrons can be shown by
Which one of the following devices makes use of the electrons to strike certain substances to produce fluorescence
The specific charge of an electron is