A) R/4
B) R/2
C) R
D) 2R
Correct Answer: A
Solution :
\[R\propto {{l}^{2}}\Rightarrow \frac{{{R}_{1}}}{{{R}_{2}}}={{\left( \frac{{{l}_{1}}}{{{l}_{2}}} \right)}^{2}}\]\[\Rightarrow \,\frac{R}{{{R}_{2}}}={{\left( \frac{l}{l/2} \right)}^{2}}=4\Rightarrow {{R}_{2}}=\frac{R}{4}\].
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