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. `0.2g`
B. `0.4g`
C. `2g`
D. `4g`

Answer

A

Explanation

`4/3piGR rho` and `g'=4/3pirhoGR'rho`
`:. (g')/g=(R')/R=0.2 implies g'=0.2g`