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Three thin rods each of length I and mass Mare placed along X, Y and Z axes in such a way that one end of each of the rods is at the origin as shown in fig

The moment of inertia of this system about Z-axis

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a
2ML23
b
4ML23
c
5ML23
d
ML23

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detailed solution

Correct option is A

IZ=I1+I2+I3=ML23+ML23+0=2ML23


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Two discs have mass ratio 1 : 2 and diameter ratio 2 : 1, then find the ratio of their moments of inertia.
 


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