The ratio of radii of gyration of a circular ring and a circular disc, of the same mass and radius, about an axis passing through their centres and perpendicular to their planes are
A
1: 
3: 2
3: 2
C
2: 1
D
Text Solution
Verified by ExpertsThe correct answer is:
D
: Let 
and 
be mass and radius of the ring and the disc respectively. Then,
Moment of inertia of ring about an axis passing through its centre and perpendicular to its plane is 
Moment of inertia of disc about the same axis is
As 
where 
is the radius of gyration
or 
and 
or 
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