To solve this problem, we need to find the cell constant using the given conductivity and resistance.$\\$The formula for conductivity $(\kappa)$ is:$\\ \kappa = \frac{1}{R} \cdot$Cell Constant$\\$Where:$\\$• $\kappa = 0.0210 \,$ohm$^{-1} \,$cm$^{-1}$ (given conductivity)$\\$• $R = 60 \,$ohm$$ (given resistance)$\\$Rearranging the formula to solve for the cell constant:$\\$Cell Constant$= \kappa \cdot R \\$Substitute the known values:$\\$Cell Constant$= 0.0210 \times 60 \\$Calculate:$\\$Cell Constant$= 1.26 \,$cm$^{-1} \\$Therefore, the value of the cell constant is $1.26 \,$cm$^{-1}$. This corresponds to Option 3.