Practicing Success
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CUET
Physics
Current Electricity
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$\text{SInce volume is constant} \Rightarrow R \propto l^2$
$\frac{R'}{R} = \frac{l'^2}{l^2} = \frac{(1.25l)^2}{l^2}$
$\Rightarrow R'= 1.56R = 15.6\Omega$