1.

Two rings of radii R and nR made from the same wire have the ratio of moments of inertia about an axis passing through their centres equal to 1:8. The value of n is

Answer»

2
`2sqrt(2)`
4
`1/2`

SOLUTION :As radius of round ring is N times, length and hence mass of wire is also n times.
`I_(1)/I_(2) =(MR^(2))/(nM(nR)^(2)) =1/n^(3) =1/8 rArr n=2`


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