Which of the following will have the least value of $\frac{q}{m}$
Electron
Proton
$\alpha$ -particle
$\beta$-particle
The mass of the electron varies with
In the Millikan's experiment, the distance between two horizontal plates is $2.5 \,\,cm$ and the potential difference applied is $250\,\, V$ . The electric field between the plates will be ....... $V/m$
Electron volt is a unit of
In Bainbridge mass spectrograph a potential difference of $1000 V$ is applied between two plates distant $1$ cm apart and magnetic field in $B = 1T$. The velocity of undeflected positive ions in m/s from the velocity selector is
Kinetic energy of emitted cathode rays is dependent on