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The moment of inertia of a dumb bell con...

The moment of inertia of a dumb bell consisting of two identical uniform solid spheres of mass m and radius R each, joined by a thin metallic rod of equal mass m (separation between the centres of the spheres is 6R) is I about the axis AB. Its moment of inertia, about an axis making an angle of `45^(@)` with AB, is

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