Assuming the earth to be a sphere of uniform density, how much would a body of weight 200N, weigh at a distance of `( R)/(2)` from the centre of the earth?
[R is the radius of the earth.]

Options

A. 100N
B. 200N
C. 400N
D. 150N

Answer

A

Explanation

Depth `d=(R )/(2) " " therefore mg' = mg (1-(d)/(R ))`
`= 200(1-(R//2)/(R ))=100 N`