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Two equal point masses are separated by a distance `d_1`. The force of gravitation acting between them is `F_1`. If the separation is decreased to `d_2`, then the new force of gravitation `F_2` , is given by
Options:
(a) `F_2=F_1` (b) `F_2=F_1(d_1/d_2)^2` (c) `F_2=F_1(d_2/d_1)^2` (d) `F_2=F_1(d_1/d_2)`

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