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Questions  

The moment of inertia of a system of four rods, each of length I and mass m, about the axis perpendicular to plane of square as shown is 

a
23ml2
b
2ml2
c
3ml2
d
103ml2

detailed solution

Correct option is D

Moment of inertia about axis 2 which is parallel to axis 1:I2=4ml212+ml22=4ml23Apply perpendicular axis theorem,I1=I2+4mx2=4ml23+4ml22=103ml2

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