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
$qVd$
$q\frac{d}{V}$
$\frac{q}{{Vd}}$
$q\frac{V}{d}$
The colour of the positive column in a gas discharge tube depends on
The fact that electric charges are integral multiples of the fundamental electronic charge was proved experimentally by
Which of the following have highest specific charge
The current conduction in a discharged tube is due to
Cathode rays consist of