Which of the following law is used in the Millikan's method for the determination of charge
Ampere's law
Stoke's law
Fleming's left hand rule
Fleming's right hand rule
(b)
Cathode rays and canal rays produced in a certain discharge tube are deflected in the same direction if
Which particles are responsible for conductivity of metals ?
In a parabola spectrograph, the velocities of four positive ions $P,Q,R$ and $S$ are $v_1$, $v_2$, $v_3$ and $v_4$ respectively
Energy of electrons can be increased by allowing them
An electron beam is moving between two parallel plates having electric field $1.125 \times {10^{ – 6}}N/m$. A magnetic field $3 \times {10^{ – 10}}T$ is also applied so that beam of electrons do not deflect. The velocity of the electron is ………… $m/s$
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