(a)[2]
In the list below, underline all the base quantities: ampere, charge, current, mass, second, temperature, weight.
(b)[3]
The potential energy $E_p$ stored in a stretched wire is given by $E_p = \tfrac{1}{2} C \sigma^2 V$, where $C$ is a constant, $\sigma$ is the strain, and $V$ is the volume of the wire. Determine the SI base units of $C$.