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 ....... $V/m$
$900 $
$10000$
$625$
$6250$
Which of the following will have the least value of $\frac{q}{m}$
Cathode rays enter into a uniform magnetic field perpendicular to the direction of the field. In the magnetic field their path will be
Order of q/m ratio of proton, $\alpha $ -particle and electron is
An electron is accelerated through a potential difference of $1000$ volts. Its velocity is nearly
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