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Question

$Four space spheres space of space diameter space 2 straight a space and space mass space straight M space are space placed space with space their space centres space on space the space four space corners space of space straight a space square space of space side space straight b. space Then space the space moment space of space Inertia space of space the space system space about space an space axis space along space one space of space the space sides space of space the space square space is space$

$\frac{4}{5} {Ma}^{2} + 2 {Mb}^{2}$
$\frac{8}{5} {Ma}^{2} + 2 {Mb}^{2}$
$\frac{8}{5} {Ma}^{2}$
$\frac{4}{5} {Ma}^{2} + 4 {Mb}^{2}$

The correct answer is: $8 over 5 Ma squared plus 2 Mb squared$

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