A) \[0.1%\]
B) \[0.2%\]
C) \[0.4%\]
D) \[0.8%\]
Correct Answer: B
Solution :
In case of stretching \[R\propto \frac{1}{{{r}^{2}}}\] \[\frac{\Delta R}{R}\times 100=2\frac{\Delta r}{r}\times 100-0,2%\]
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