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Q.

Three particles, each of mass m, are placed at the vertices of an equilateral triangle of side a. The gravitational potential at the centroid is

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a

zero

b

-23Gma

c

-3Gma

d

-33GMa

answer is B.

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Detailed Solution

Refer to the figure 

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Gravitational potential at O is

V=-Gmr-Gmr-Gmr =-3Gmr=-3Gma3=-33Gma

Hence the correct choice is (b). 

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