Question

Two air bubbles in water

• A. Attract each other
• B. Repel each other
• C. Neither attract nor repel
• D. None of these

Answer 1

The correct option is A Attract each other

The two air bubbles in water attract each other. The mass of air bubbles in water (denser medium in comparison to air) behaves like a negative mass as far as gravitational attraction is concerned. So by Newton' Law of gravitation
$\overline{F}=G\frac{m_1{m}_2}{r^2}\hat{r}$
but in water $\overline{F}=\frac{G(-m_1)(-m_2)}{r^2}\hat{r}=\frac{G{m}_1{m}_2}{r^2}\hat{r}$
It means that force has attractive nature between two air bubbles in water