MHT CET Physics question
Two rings of radius 'R' and 'nR' made of same material have the ratio of moment of inertia about an axis passing through its centre and perpendicular to the plane is 1:8. The value of 'n' is (mass per unit length= λ) [MHT-CET 2019]
Answer: (A)
Solution
, so and ; 4, 1 and 3 give ratios 64, 1 and 27 for . Hence the correct option is (a).