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Questions  

Three identical point masses, each of mass 1 kg lie in the XY plane at points (0,0) , (0,0.2m) and (0.2m,0). The net gravitational force on the mass at the origin is 

a
1.67×10−9(j^+i^)
b
3.34×10−10(j^+i^)
c
1.67×10−9(i^−j^)
d
3.34×10−10(i^−j^)

detailed solution

Correct option is A

F→AB = GMAMBr2ABj^ = 1.67×10−9j^NF→BC = GMBMcr2BCi^ = 1.67×10−9i^NF→net = 1.67×10−9i+jN

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