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Four identical point masses each equal t...

Four identical point masses each equal to m are placed at the corners of a square of side a. The force on a point mass m placed at the point of intersection of the two diagonals is

A

`(4Gmm')/a^2`

B

`(2Gmm')/a^2`

C

`(Gmm')/a^2`

D

Zero

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The correct Answer is:
D
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