Two identical spherical balls of mass \(M\) and radius \(R\) each are stuck on two ends of a rod....

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Two identical spherical balls of mass \(M\) and radius \(R\) each are stuck on two ends of a rod of length \(2 R\) and mass \(M\) (see figure). The moment of inertia of the system about the axis passing perpendicularly through the centre of the rod is:
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