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 _____$\mathrm{cm}$.