A) 125 N
B) 250 N
C) 500 N
D) 1000 N
Correct Answer: B
Solution :
Weight on surface of earth, \[mg=500\,N\] and weight below the surface of earth at \[d=\frac{R}{2}\] \[m{g}'=mg\left( 1-\frac{d}{R} \right)=mg\left( 1-\frac{1}{2} \right)=\frac{mg}{2}=250\,N\]
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