In Millikan’s oil drop experiment, an oil drop of mass $16 \times {10^{ - 6}}kg$ is balanced by an electric field of ${10^6}V/m.$ The charge in coulomb on the drop, assuming $g = 10\,m/{s^2}$ is
$6.2 \times {10^{ - 11}}$
$16 \times {10^{ - 9}}$
$16 \times {10^{ - 11}}$
$16 \times {10^{ - 13}}$
Write name of universal and fundamental particle of matter.
Write information about negative electric charge emitted from metals when $UV$ light is incident on them or metals are heated.
When electron beam passes through an electric field, they gain kinetic energy. If the same beam passes through magnetic field, then
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
The fact that electric charges are integral multiples of the fundamental electronic charge was proved experimentally by