A wire of length $L$ and radius $r$ is clamped rigidly at one end. When the other end of the wire is pulled by a force $f$, its length increases by $l$. Another wire of same material of length $2 L$ and radius $2 r$ is pulled by a force $2 f$. Then the increase in its length will be
A$2\,l$
B$l$
C$4 \ l$
D$l / 2$
JEE MAIN 2023, Medium
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B$l$
b $\frac{2 f }{\pi(2 r )^2}= Y \frac{\ell^{\prime}}{2 L }$
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