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The radius of gyration of a disc of mass 100 g and radius 5 cm about an axis pasing through centre of gravity and perpendicular to the plane is

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The radius of gyration of a disc of mass 100 g and radius 5 cm about an axis pasing through centre of gravity and perpendicular to the plane is
A. 0.5cm
B. 2.5cm
C. 3.54cm
D. 6.54cm
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Correct Answer - C
`K_(c )=(R )/(sqrt(2))`
`= (5)/(sqrt(2))=5xx0.707 = 3.54 cm`.
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