A charge of magnitude $3e$ and mass $2m$ is moving in an electric field $\overrightarrow E .$ The acceleration imparted to the charge is
$2Ee/3m$
$3Ee/2m$
$2m/3Ee$
$3m/2Ee$
In Millikan's experiment for the determination of the charge on the electron, the reason for using the oil is
In an electron gun, the electrons are accelerated by the potential $V$. If e is the charge and $m$ is the mass of an electron, then the maximum velocity of these electrons will be
Write and explain methods to obtain emission of electron from metal.
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
In Thomson's experiment if the value of $q/m$ is the same for all positive ions striking the photographic plate, then the trace would be