In Thomson's method of determining $e/m$ of electrons
Electric and magnetic fields are parallel to electrons beam
Electric and magnetic fields are perpendicular to each other and perpendicular to electrons beam
Magnetic field is parallel to the electrons beam
Electric field is parallel to the electrons beam
Positive rays was discovered by
An electron of charge $‘e’$ coulomb passes through a potential difference of $V$ volts. Its energy in ‘joules’ will be
Which of the following is not the property of a cathode ray
The mass of the electron varies with
The fact that electric charges are integral multiples of the fundamental electronic charge was proved experimentally by