Question

what is the value of small G and big G in Physics​

Answer 1

small g =9.8 m/S ^2

big g = 6.67×10^-11N m^2 /kg^3

Answer 2

The gravitational constant is familiarly known as "big G" to distinguish it from "little g," the acceleration due to the Earth's gravity.ii Despite its name, big G is tiny – about 6.67 x 10-11 m3 kg-1 s-2 – and comparatively feeble, roughly a trillion trillion trillion times weaker than the electromagnetic force responsible for affixing souvenir magnets to refrigerators. And its weakness makes it difficult to measure.

And the value of small g is 9.8m/s^2