When the length and area of cross-section both are doubled, then its resistance
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(c) ${R_1} \propto \frac{l}{A} \Rightarrow {R_2} \propto \frac{{2l}}{{2A}}i.e.\,{R_2} \propto \frac{l}{A}$
$\therefore {R_1} = {R_2}$
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