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
In the Millikan's experiment, the distance between two horizontal plates is $2.5 \,\,cm$ and the potential difference applied is $250\,\, V$ . The electric field between the plates will be ....... $V/m$
Order of q/m ratio of proton, $\alpha $ -particle and electron is
What is value (magnitude) of electric field required for field emission ?
An electron is moving in electric field and magnetic field it will gain energy from
An $\alpha$ particle is accelerated through a p.d of ${10^6}$ volt then $ K.E$ . of particle will be .......... $MeV$