4.9 x 10-9N
1.3 x 10-6N
6.6 x 10-8N
6.6 x 10-6N
2.6 x 10-9N
Correct answer is D
F = Gm1m2r2=6.6×10−11×80×500.2×0.2
= 6.6 x 10-6N
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