A) \[d=2\,km\]
B) \[d=\frac{1}{2}\,km\]
C) \[d=\,1\,km\]
D) \[d=\frac{\begin{align} & 3 \\ & 3 \\ \end{align}}{2}\,km\]
Correct Answer: A
Solution :
Above earth surface Below earth surface \[g'=g\left( 1-\frac{2h}{{{R}_{e}}} \right)\] \[g'=g\left( 1-\frac{d}{{{R}_{e}}} \right)\] \[\Delta g'=g\frac{2h}{{{R}_{e}}}\]?.(i) \[\Delta g=g\frac{d}{{{R}_{e}}}\]?(ii) From (1) & (2) d = 2h d = 2 × 1 km
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