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
$qVd$
$q\frac{d}{V}$
$\frac{q}{{Vd}}$
$q\frac{V}{d}$
Electric field and magnetic field in Thomson mass spectrograph are applied
An electron is moving with constant velocity along $x - $ axis. If a uniform electric field is applied along $y - $ axis, then its path in the $x - y$ plane will be
A narrow electron beam passes undeviated through an electric field $E = 3 \times {10^4}volt/m$ and an overlapping magnetic field $B = 2 \times {10^{ - 3}}Weber/{m^2}$. If electric field and magnetic field are mutually perpendicular. The speed of the electrons is
When cathode rays (tube voltage $~ 10 kV$) collide with the anode of high atomic weight then we get
The specific charge of an electron is