Q.

A disc of mass ‘m’ and radius R has a concentric hole of radius ‘r’. Its M.I. about an axis through centre and normal to its plane is

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a

b

c

d

answer is D.

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Detailed Solution

Mass of ring of radius x and thickness dx } = dmMI of ring (DI) = dmx2  of radius 'x'MI of disc =
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A disc of mass ‘m’ and radius R has a concentric hole of radius ‘r’. Its M.I. about an axis through centre and normal to its plane is