The moment of inertia of a thin circular lamina of mass $1\,kg$ and diameter $0.2\,m$ rotating about one of its diameters is:
- A$5 \times 10^{-3}\,kg\cdot m^2$
- B$2.5 \times 10^{-3}\,kg\cdot m^2$
- C$4 \times 10^{-2}\,kg\cdot m^2$
- D$0.2\,kg\cdot m^2$
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