Define mobility and write its $SI$ unit.
(N/A) Mobility $(\mu)$ is defined as the magnitude of the drift velocity $(v_d)$ per unit electric field $(E)$.
Mathematically, $\mu = \frac{v_d}{E}$.
The $SI$ unit of drift velocity is $m/s$ and the $SI$ unit of electric field is $V/m$ or $N/C$.
Therefore, the $SI$ unit of mobility is $\frac{m/s}{V/m} = m^2 V^{-1} s^{-1}$ or $m^2 / (V \cdot s)$.
Mathematically, $\mu = \frac{v_d}{E}$.
The $SI$ unit of drift velocity is $m/s$ and the $SI$ unit of electric field is $V/m$ or $N/C$.
Therefore, the $SI$ unit of mobility is $\frac{m/s}{V/m} = m^2 V^{-1} s^{-1}$ or $m^2 / (V \cdot s)$.
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