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Q.

The ratio of the radii of gyration of a circular disc and a circular ring of the same radii about a tangential axis perpendicular to the plane of disc or ring is

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a

5:6

b

 2: 3

c

1: 2

d

32

answer is D.

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Detailed Solution

The radius of gyration,K=Im
Kdisc =12mR2+mR2m=32R Kring =mR2+mR2m=2R ∴  KdiscKring =3/22=32

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