Force or potential energy of masses at the corners of a square

1. A.
   $- \frac{Gm}{d}\lbrack(4 + \sqrt{2})m + 4\sqrt{2}M\rbrack$
2. B.
   $- \frac{Gm}{d}\lbrack(4 + \sqrt{2})M + 4\sqrt{2}\text{ }m\rbrack$
3. C.
   $- \frac{Gm}{d}\left\lbrack 3{\text{ }m}^{2} + 4\sqrt{2}M \right\rbrack$
4. D.
   $- \frac{Gm}{d}\left\lbrack 6{\text{ }m}^{2} + 4\sqrt{2}M \right\rbrack$

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1. A.
   $\frac{L}{2}$
2. B.
   $4\text{ }L$
3. C.
   $3\text{ }L$
4. D.
   $2\text{ }L$

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1. A.
   2
2. B.
   3
3. C.
   1
4. D.
   $2\sqrt{5}$

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