A) \[\frac{7}{2}M{{R}^{2}}\]
B) \[3{{R}^{2}}\]
C) \[\frac{3}{2}M{{R}^{2}}\]
D) \[5M{{R}^{2}}\]
Correct Answer: A
Solution :
The axis XX' is a diameter for ring A but is a tangent in the plane of ring for ring B and ring C. \[I={{I}_{A}}+{{I}_{B}}+{{I}_{C}}\] \[=\frac{1}{2}\,M{{R}^{2}}+\frac{3}{2}M{{R}^{2}}+\frac{3}{2}M{{R}^{2}}=\,\frac{7}{2}\,M{{R}^{2}}\]
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