Cathode rays and canal rays produced in a certain discharge tube are deflected in the same direction if
A magnetic field is applied normally
An electric field is applied normally
An electric field is applied tangentially
A magnetic field is applied tangentially
An electron (charge =$1.6 \times {10^{ - 19}}C$) is accelerated through a potential of $ 100,000 V$. The energy acquired by the electron is
A beam of cathode rays is subjected to crossed electric $(E)$ and magnetic fields $(B).$ The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by (where $V$ potential diffrence between kethod and anode)
When the speed of electrons increases, then the value of its specific charge
In Thomson's method of determining $e/m$ of electrons
In $1897$, J.J.Thomson invented which particle ?