Three rods each of length L and mass M are placed along X, Y and Z axes in such a way that one end of each rod is at the origin. The moment of inertia of the system about Z-axis is
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a
ML23
b
2 ML23
c
3 ML22
d
2 ML212
answer is B.
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Detailed Solution
Moment of inertia of a rod about one end =ML23 As I=I1+I2+I3 ∴ I=0+ML23+ML23=2 ML23 .