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)
$\frac{{{B^2}}}{{2V{E^2}}}$
$\;\frac{{2V{B^2}}}{{{E^2}}}$
$\;\frac{{2V{E^2}}}{{{B^2}}}$
$\frac{{{E^2}}}{{2V{B^2}}}$
Which particles are responsible for conductivity of metals ?
$1$ $J$ is equal to how many electron volt?
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
${O^{ + + }},\;{C^ + },\;H{e^{ + + }}$ and ${H^ + }$ ions are projected on the photographic plate with same velocity in a mass spectrograph. Which one will strike farthest
What is the unit of energy in atomic and nuclear physics ? Define it.