A) \[4\times {{10}^{-6}}\]
B) \[3\times {{10}^{-8}}\]
C) \[2\times {{10}^{-9}}\]
D) \[6\times {{10}^{-8}}\]
Correct Answer: A
Solution :
[a] \[Strain=\frac{F/A}{\gamma }\And F=mg\] \[A=\pi {{r}^{2}}\]
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