Two identical spheres exert a force on each other when their centres are apart

PHYSICS · Single correct · CBSE · Physics · Gravitation · Gravitation

Problem

Two identical spheres exert a force FF on each other when their centres are rr apart. Which one of the following single actions will make the force exactly 4F4F? (a) Double the mass of one sphere only (b) Increase the separation to 2r2r (c) Decrease the separation to r2\dfrac{r}{2} (d) Decrease the separation to r2\dfrac{r}{\sqrt{2}}

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