A) \[L=10cm,\,\,D=1\,mm\]
B) \[L=100\,cm,\,D=\,2mm\]
C) \[L=200\,cm,\,D=\,3mm\]
D) \[L=300\,cm,\,D=\,4\,mm\]
Correct Answer: B
Solution :
\[l=\frac{FL}{\pi {{r}^{2}}Y}\]\ \[l\propto \frac{L}{{{r}^{2}}}\] Ratio of \[\frac{L}{{{r}^{2}}}\] is maximum for wire in option .
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