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Three equal masses each of mass 'm' are ...

Three equal masses each of mass 'm' are palced at the three corners of an equilateral of side a
If a fourth particle of equal mass is placed at the centre of triangle then net force acting on it is equal to .

A

`(Gm^(2))/(a^(2))`

B

`(4Gm^(2))/(3a^(2))`

C

`(3Gm^(2))/(a^(2))`

D

zero

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