If the density of a small planet is the same as that of earth while the radius of the planet is `0.2` times that of the earth the gravitational on the surface of that planet is :

Options

A. 0.2 g
B. 0.4 g
C. 0.2 g
D. 4 g

Answer

A

Explanation

`g=4/3 pi GRp` and `g=4/3 pi GR p`
`therefore (g')/(g)=(R ')/(R )=0.2`
and g' =0.2 g