The current conduction in a discharged tube is due to
Electrons only
$+ve$ ions and electrons
$-ve$ ions and electrons
$+ ve$ ions, $-ve$ ions and electrons
In a Millikan's oil drop experiment the charge on an oil drop is calculated to be $6.35 \times {10^{ - 19}}C$. The number of excess electrons on the drop is
Cathode rays are produced when the pressure is of the order of
An electron of charge $‘e’$ coulomb passes through a potential difference of $V$ volts. Its energy in ‘joules’ will be
Write name of universal and fundamental particle of matter.
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)