In Millikan's experiment for the determination of the charge on the electron, the reason for using the oil is
It is a lubricant
Its density is higher
It vapourises easily
It does not vapourise
The specific charge of an electron is
Which of the following law is used in the Millikan's method for the determination of charge
An electron is moving with constant velocity along $x - $ axis. If a uniform electric field is applied along $y - $ axis, then its path in the $x - y$ plane will be
An $\alpha$ particle is accelerated through a p.d of ${10^6}$ volt then $ K.E$ . of particle will be .......... $MeV$
The mass of a particle is $400$ times than that of an electron and the charge is double. The particle is accelerated by $5 V$. Initially the particle remained in rest, then its final kinetic energy will be ........... $eV$