$6.$ A planet has density $\backslash ($ P $\backslash ),$ radius $\backslash ($ R $\backslash )$ and acceleration due to gravity as g $.$ If the radius of the planet were doubled keeping the density same, the acceleration due to gravity at the surface will be

$($Jharhlandi Nrse Stage$-1/2!15)$

$($A$)4$ g

$($B$)\backslash (2$ g $\backslash )$

$($C$)\backslash ($ g $\backslash )$

$($D$)\backslash (\backslash$mathrm$\{$g$\}/2\backslash )$