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The force of attraction between two unit point masses separated by a unit distance is called:
(a) gravitational potential
(b) acceleration due to gravity
(c) gravitational field strength
(d) universal gravitational constant
We know the formula for the gravitational force $F=G\frac{m_1m_2}{r^2}$
Here, masses are $m_1=1\ unit$ and $m_2=1\ unit$
Distance $r=1\ unit$
Then, $F=G\frac{1\times1}{1^2}$
Or $F=G$
Therefore, the force of attraction between two unit point masses separated by a unit distance is called the universal gravitational constant.
So, option $(d)$ is correct.
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