A) \[1\,%\]
B) \[2\,%\]
C) \[0.1\,%\]
D) \[0.2\,%\]
Correct Answer: D
Solution :
\[l\pi {{r}^{2}}\,=\] Constant \[\frac{\Delta l}{l}+2\,\frac{\Delta r}{r}=0\]
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