Question

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

Answer 1

$\text{Gravitational force } = \frac{Gm_1m_2}{r^2}$
here , you can see that , gravitational force is independent with medium . hence, there are not any change in Gravitational force , when point masses are dipped in water keeping the separation between their same.

hence, intial gravitational force = final gravitational force.