A) \[8.9:7.2\]
B) \[7.2:8.9\]
C) \[8.9\times 7.2:1~\]
D) \[1:8.9\times 7.2\]
Correct Answer: A
Solution :
[a] \[{{I}_{1}}=\frac{1}{2}{{M}_{2}}r_{1}^{2}\] \[{{I}_{2}}=\frac{1}{2}{{M}_{2}}r_{2}^{2}\] \[\frac{{{I}_{1}}}{{{I}_{2}}}=\frac{\frac{1}{2}{{M}_{1}}r_{1}^{2}}{\frac{1}{2}{{M}_{2}}r_{2}^{2}}=\frac{r_{1}^{2}}{r_{2}^{2}}=\frac{{{d}_{2}}}{{{d}_{1}}}=\frac{8.9}{7.2}\]
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