Capacitance of an isolated conducting sphere
= Capacitance of an isolated conducting sphere
{title2=$C=4\pi\epsilon R$}
An isolated conducting sphere of radius $R$ in a medium of <permittivity> $\epsilon$ has surface <electrostatic potential> $V=Q/(4\pi\epsilon R)$ relative to infinity. Thus its <capacitance> is $C=Q/V=4\pi\epsilon R$.