Question

What is the SI unit of gravitational constant?

• A. $N{m}^{-2}K{g}^{-2}$
• B. $N{m}^{3}K{g}^2$
• C. $N{m}^{2}K{g}^{-2}$
• D. $NmK{g}^{-2}$

Answer 1

The correct option is C $N{m}^{2}K{g}^{-2}$

Gravitational force: F

F = $\frac{G{M}_1{M}_2}{R^2}$then,

G = $\frac{F{R}^2}{M_1{M}_2}$

unit of F = N
unit of mass = Kg
unit of R = m
unit of G = $N{m}^{2}k{g}^{-2}$