Question

Which of the following statements is correct regarding the universal gravitational constant $G$?

• A. $G$ has same value in all systems of units
• B. The value of $G$ is same everywhere in the universe
• C. The value of $G$ was first experimentally determined by Johannes Kepler
• D. $G$ is a vector quantity

Answer 1

Answer: (B)

G has different value in different system of units.
In SI system the value of $G$ is $6.67\times 10^{-11}N{m}^{2}k{g}^{-2}$ whereas in CGS its value is $6.67\times 10^{-8}$ dynecm ${}^2{g}^{-2}$
The value of $G$ is same throughout the universe.
The value of $G$ was first experimentally determined by English scientist Henry Cavendish.
$G$ is a scalar quantity.