Question

Two rings of radius R and nR made up of same material have the ratio of moment of inertia about an axis passing through centre as 1 : 8. The value of n is :

• A. 2
• B. 2$\sqrt { 2 }$
• C. 4
• D. $\frac { 1 } { 2 }$

Answer 1

Answer: (A)

2

Answer 2

For Ring, I = MR² (l × 2pR) R²

Þ I = 2plR³ (where, l = linear density)

\ = Þ $\frac { 1 } { 8 }$ = Þ n = 2