Question
How is the gravitational force between two point masses affected when they are dipped in water keeping the separation between them the same?

Answer

The Newton’s Universal law of gravitational force of attraction (F) between two bodies of masses $m_1, m_2$ separated by distance r is $\text{F}=\frac{\text{Gm}_1\text{m}_2}{\text{r}^2}$ G does not depend upon the medium. So force of attraction does not change if the masses are kept in water or any other medium.

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