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The gravitational force of attraction between two objects is $x$. Keeping the masses of the objects unchanged, if the distance between the objects is halved, then the magnitude of gravitational force between them will
(a) $x/4$
(b) $x/2$
(c) $2x$
(d) $4x$
As known that the force of attraction between the two objects is inversely proportional to the square of the distance between the two objects.
So, $x=G\frac{m_1m_2}{r^2}$
Here, $x\rightarrow$ force of attraction between the two objects.
$r\rightarrow$ distance between the two objects.
$m_1$ & $m_2\rightarrow$ masses of the two objects
If the distance between the two objects is halved, then it will become $\frac{r}{2}$.
Then, force of attraction, $x'=G\frac{m_1m_2}{(\frac{r}{2})^2}$
Or $x'=(G\frac{m_1m_2}{(\frac{r^2}{4})})$
Or $x'=4\times x$
So, option $(d)$ is correct.