A system consisting of two masses $m_{1}$ and $m_{2}$ separated by distance $r$ is immersed in water. What is the effect on gravitational force?

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No effect

It is weakened

It becomes stronger

It vanishes

answer is A.

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Detailed Solution

A system consisting of two masses

m_{1}

and

m_{2}

separated by distance

r

is immersed in water. Then there is no effect on gravitational force between them.
From Newton’s law of gravitation, the force of attraction between any two bodies is directly proportional to the product of its masses and inversely proportional to the square of its separation.

F \propto m_{1} m_{2}

F \propto \frac{1}{r^{2}}

F = \frac{G m_{1} m_{2}}{R^{2}}

G

is universal gravitational constant

m_{1}

and

m_{2}

are masses

r

is the separation between the masses
The force of attraction between bodies does not depend upon the medium. When these two bodies are immersed in water, then there would be no change in the gravitational force between them.

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