Which particles are responsible for conductivity of metals ?

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Which of the following will have the least value of $\frac{q}{m}$

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 ....... $V/m$

$1$ $J$ is equal to how many electron volt? 

From the following, what charges can be present on oil drops in Millikan's experiment

(Here e is the electronic charge)

An $\alpha$ particle is accelerated through a p.d of ${10^6}$ volt then $ K.E$ . of particle will be .......... $MeV$