When the speed of electrons increases,then the value of its specific charge

In a Thomson set-up for the determination of $e/m$,electrons accelerated by $2.5 \ kV$ enter the region of crossed electric and magnetic fields of strengths $3.6 \times 10^4 \ Vm^{-1}$ and $1.2 \times 10^{-3} \ T$ respectively and go through undeflected. The measured value of $e/m$ of the electron is equal to

In a discharge tube at $0.02\, mm$ pressure,there is a formation of
[$AIPMT$ $1996$]

Cathode rays and canal rays produced in a certain discharge tube are deflected in the same direction if

Who discovered the presence of electric charge on an electron?

The specific charge of an electron is