\( \Rightarrow \) \(\frac{{{R_2}}}{{{R_1}}} = \frac{{{l_2}}}{{{l_1}}} \times \frac{{{r_1}^2}}{{{r_2}^2}}=\left( {\frac{2}{1}} \right) \times {\left( {\frac{1}{2}} \right)^2}\) \( = \frac{1}{2}\)

\( \Rightarrow \) \({R_2} = \frac{{{R_1}}}{2},\) specific resistance doesn't depend upon length, and radius.