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Q.

Four similar point masses (each of mass m) are placed on the circumference of a disc of mass M and radius R. The moment of inertia of the system about the system about the normal axis through the center O will be:

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a

12MR2+4mR2

b

MR2+4mR2

c

MR22+8mR25

d

MR2+85mR2

answer is B.

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Detailed Solution

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I=Idisc+IMasses=MR22+4mR2

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