3.50 x 10-10N
3.71 x 10-8 N
3.57 x 10-2N
4.00 x 102N
Correct answer is B
The force of attraction between the two spheres is given by F (GM1 M2)/r2 = (6.67X 10-11 X5X10)/(0.3)2 = 3.71 X 10-8N.
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