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Four identical particles of mass m are kept at the four corners of a square. If the gravitational force exerted on one of the masses by the other masses is 2 2 L Gm 32 1 2 2 ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + , the length of the sides of the square is

1. 2L
2. 3L
3. 4L
4. 2 L

Correct answer: 4L

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