Three thin 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 as shown. The moment of inertia of this system about Z− axis is
A
2ML23
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B
4ML23
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C
5ML23
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D
ML23
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Solution
The correct option is A2ML23 Iz=I1+I2+I3 =ML23+ML23+0 =2ML23