Moment of inertia of a thin rod

Question

Moment of inertia of a thin uniform rod rotating about perpendicular axis passing through its centre is I . If the same rod is bent into a ring and moment of inertia about its diameter is I'. Then the ratio I/ I'is

A) 8/3( pie)2

B) 5/3(pie) square

c) 3/ 2( pie) square

D ) 2/3 (pie) square

Answer 1

Solution........