(a)[2]
The ampere, metre and second are SI base units. State two more SI base units.
(b)[3]
The mean drift speed $v$ of electrons passing through a metal conductor is described by $v = \frac{\mu F}{e}$, where $e$ is the charge on an electron, $F$ is a force acting on the electron and $\mu$ is a constant. Determine the SI base units of $\mu$.