Which scientist invented cathode rays ? 

$1$ $J$ is equal to how many electron volt? 

When subjected to a transverse electric field, cathode rays move

The fact that electric charges are integral multiples of the fundamental electronic charge was proved experimentally by

Write dimensional formula and electron volt of electron volt. 

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)