Physics - Elecrostatics Question with Solution | TestHub

Three concentric spherical metallic shells $X, Y$and $Z$ of radius $a, b$ and $c$ respectively$\left[a<b<c\right]$ have surface charge densities $\sigma , – \sigma$ and $\sigma$, respectively. The shells $X$ and $Z$ are at same potential. If the radii of$X \& Y$ are $2 \mathrm{cm}$ and $3 \mathrm{cm}$, respectively. The radius of shell $Z$ is _____$\mathrm{cm}$.