The following four wires of length \( L \) and radius \( r \) are made of the same material. Whe...

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The following four wires of length \( L \) and radius \( r \) are made of the same material. When they are under same tension, the largest extension is produced in
(a) \( L=200 \mathrm{~cm}, r=0.5 \mathrm{~mm} \)
(b) \( L=150 \mathrm{~cm}, r=0.3 \mathrm{~mm} \)
(c) \( L=250 \mathrm{~cm}, r=0.1 \mathrm{~mm} \)
(d) \( L=400 \mathrm{~cm}, r=0.2 \mathrm{~mm} \)
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