When current flows through a conductor,the order of magnitude of the drift velocity of electrons is

We are able to obtain fairly large currents in a conductor because

$A$ charged particle is moving in an electric field of $3 \times 10^{-10} \text{ Vm}^{-1}$ with mobility $2.5 \times 10^6 \text{ m}^2 \text{V}^{-1} \text{s}^{-1}$. Its drift velocity is:

The unit of mobility in terms of fundamental units is . . . . . . .

Derive the equation of mobility in terms of relaxation time $(\tau)$. Write its unit.

The drift speed of electrons in a material is found to be $0.3 \ m s^{-1}$ when an electric field of $2 \ V m^{-1}$ is applied across it. The electron mobility (in $m^2 \ V^{-1} \ s^{-1}$) in the material is