Answer:
Option B
Explanation:
we know that, R = $\frac{\rho l}{A}$
or R = $\frac{\rho l^{2}}{Volume}$ → $R\propto l^{2}$
According to question $l_{2}= nl_{1}$
$\frac{R_{2}}{R_{1}} = \frac{n^{2}l_1^2}{l_1^2}$
or $\frac{R_{2}}{R_{1}} = n^{2}$
$R_{2}= n^{2}R_{1}$
