question_answer

If three rings each of mass m and radius r are arranged as shown in figure, then the moment of inertia of the system about the axis XX will be

A)  \[3\,m{{r}^{2}}\]                            

B)  \[\frac{3}{2}\,m{{r}^{2}}\]

C)  \[7\,m{{r}^{2}}\]                            

D)  \[\frac{7}{2}\,m{{r}^{2}}\]

Correct Answer: D

Solution :

                Moment of inertia of the system about \[XX\]