A) \[R\]
B) \[\frac{R}{\sqrt{2}}\]
C) \[\frac{R}{4}\]
D) \[\frac{R}{2}\]
Correct Answer: D
Solution :
In case of a disc rotating about an axis through its centre of mass and parallel to its plane \[K=\sqrt{\frac{I}{M}}=\sqrt{\frac{\left( \frac{1}{4} \right)M{{R}^{2}}}{M}}=\frac{R}{2}\]
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