Question

Two rings have their moments of inertia in the ratio 2 : 1 and their diameters are in the ratio 2 : 1. The ratio of their masses will be

(A) 2 : 1

(B) 1 : 2

(C) 1 : 4

(D) 1 : 1

Answer 1

Correct option (B) 1 : 2

Explanation:

I1/I2 = (M1R12)/(M2R22) = 2 : 1

M1/M2 = 1 : 2