A long, hollow conducting cylinder is kept coaxially inside another long, hollow conducting cylinder of larger radius. Both the cylinders are initially electrically neutral.
IIT 2007, Advanced
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$\mathrm{dV}=-\overrightarrow{\mathrm{E}} \cdot \mathrm{d} \overrightarrow{\mathrm{r}}$
and $\mathrm{E}=\frac{\lambda}{2 \pi \varepsilon_0 \mathrm{r}}$
where $\mathrm{r}$ is distance from the axis of cylindrical charge distribution ( $\mathrm{r}$ is equal to or greater than radius of cylindrical charge distribution).
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