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Q.

The moment of inertia of a hollow thick spherical shell of mass M and its inner radius R1  and outer radius R2  about diameter is :

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a

2M5(R25R15)(R23R13)

b

2M3(R25R15)(R23R13)

c

4M7(R25R15)(R23R13)

d

4M5(R25R15)(R23R13)

answer is A.

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Detailed Solution

ρ=M4π3R23-R13 Ishell=2M2R225-2M1R125---(1) M2=ρ4πR233=M4π3R23-R134πR233=MR23R23-R13 lly M1=MR13R23-R13 substituting eqn(1) aand (2) we get  Ishell=2MR25-R155R23-R13

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