An infinitely long thin wire, having a uniform charge density per unit length of $5 \mathrm{nC} / \mathrm{m}$, is passing through a spherical shell of radius 1 m , as shown in the figure. A 10 nC charge is distributed uniformly over the spherical shell. If the configuration of the charges remains static, the magnitude of the potential difference between points $P$ and $R$, in Volt, is. [Given: $\ln \mathrm{SI}$ units $\frac{1}{4 \pi \dot{o}_0}=9 \times 10^9, \ln 2=0.7$. Ignore the area pierced by the wire.