question_answer

A thin circular disk is in the\[xy\] plane as shown in the figure. The ratio of its moment of inertia about z and z’ axes will be                                                                                                [JEE Main Online 16-4-2018]

A)  \[1:2\]              

B)       \[1:4\]

C)  \[1:3\]              

D)       \[1:5\]   

Correct Answer: C

Solution :

[c] We know that, the moment of inertia of the circular disk about the center is Using parallel axis theorem,