Answers

2015-10-27T09:37:54+05:30
Since , g = GM/R²

so g ∝ 1/R²

since Radius becomes half then g will increase twice
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Wrong ans!!
Yeah its square , i unnoticed it , it will become 4 , thnx :)
You're welcome :)
:)
2015-10-27T14:23:36+05:30
g = GM/R² 
If Radius becomes half (R/2)
Then,
g' = GM / (R/2)² 
   = 4 GM / R²
   = 4 g 
So, If the radius becomes half then g becomes 4 times.
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Hope it helps :) & if it does please mark as best ^_^