In which case there is maximum extension in the wire, if same force is applied on each wire
A$L = 500\, cm, d = 0.05\, mm$
B$L = 200 \,cm, d = 0.02 \,mm$
C$L = 300 \,cm, d = 0.03 \,mm$
D$L = 400\, cm, d = 0.01\, mm$
Medium
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D$L = 400\, cm, d = 0.01\, mm$
d (d) $l \propto \frac{L}{{{r^2}}}$ $(Y$ and $F$ are constant$)$
Maximum extension takes place in that wire for which the ratio of $\frac{L}{{{r^2}}}$ will be maximum.
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