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A large number of identical point mass...

A large number of identical point masses m are placed along x - axis ,at x = 0,1,2,4,`………` The magnitude of gravitational force on mass at origin ( x =0) , will be

A

`Gm^(2)`

B

`4/3Gm^(2)`

C

`2/3Gm^(2)`

D

`5/4Gm^(2)`

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The correct Answer is:
B
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