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Four solid spheres each of mass m and radius a, have their centers on the vertices of a square whose side is b. Find moment of inertia about the given axis?

(Assume spheres are connected using a light frame)

(a) $m\left({8a^2\over5}+2b^2\right)$

(b) $m\left({8a^2\over5}+4b^2\right)$

(c) $m\left({4a^2\over5}+2b^2\right)$

(d) $m\left({4a^2\over5}+b^2\right)$
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