A) \[1:6.25\]
B) 6.25 : 1
C) \[1:\sqrt{2.5}\]
D) 1 : 2.5
Correct Answer: A
Solution :
\[K\propto {{l}^{2}}\Rightarrow \frac{{{K}_{1}}}{{{K}_{2}}}=\frac{l_{1}^{2}}{l_{2}^{2}}={{\left( \frac{10}{25} \right)}^{2}}=\frac{1}{6.25}\]
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