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Four point masses each of mass m are pla...

Four point masses each of mass m are placed at corners of square of side d and a mass M is placed at centre. The gravitational potential energy of system is

A

`-[GM(4sqrt(2) M + (4 + sqrt(2)m))]/d`

B

`-[GM(4sqrt(2)m + (4 + sqrt(2)M))]/d`

C

`[GM(4sqrt(2) M + (4 + sqrt(2)m))]/d`

D

none

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