Moment of inertia of masses or spheres placed at the corners of a square

1. A.
   $ml^{2}$
2. B.
   $2\text{ }ml^{2}$
3. C.
   $3\text{ }ml^{2}$
4. D.
   $\sqrt{3}\text{ }ml^{2}$

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1. A.
   $\frac{4}{5}{ma}^{2}$
2. B.
   $\frac{8}{5}ma^{2} + mb^{2}$
3. C.
   $\frac{4}{5}ma^{2} + 2mb^{2}$
4. D.
   $\frac{8}{5}ma^{2} + 2mb^{2}$

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