When a certain weight is suspended from a long uniform wire, its length increases by one cm. If the same weight is suspended from another wire of the same material and length but having a diameter half of the first one then the increase in length will be ........ $cm$
A$0.5 $
B$2$
C$4$
D$8$
Medium
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C$4$
c (c)$l = \frac{{FL}}{{AY}} \Rightarrow l \propto \frac{1}{{{r^2}}}$ $(F, L$ and $Y$ are constant)
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