Capacitance per unit length
= Capacitance per unit length
Capacitance per unit length is the charge per unit length divided by the potential difference. A vacuum coaxial cable with radii $a<b$ has
$$
C'=\frac{2\pi\varepsilon_0}{\log(b/a)}.
$$
= Capacitance per unit length
Capacitance per unit length is the charge per unit length divided by the potential difference. A vacuum coaxial cable with radii $a<b$ has
$$
C'=\frac{2\pi\varepsilon_0}{\log(b/a)}.
$$