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Four identical uniform thin rods, each ...

Four identical uniform thin rods, each of mass m and length l are joined to a common point O as shown in the figure. Moment of inertia of the system about an axis passing through O and lying in the plane of rods is

A

`1/3 ml^2`

B

`ml^2`

C

`4/3 m/l^2`

D

`2/3 m/l^2`

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