A) 32 km
B) 80 km
C) 1.253 km
D) 64 km
Correct Answer: A
Solution :
\[g\propto \frac{GM}{{{r}^{2}}}\]\\[g\propto \frac{1}{{{r}^{2}}}\]or \[r\propto \frac{1}{\sqrt{g}}\] If g decrease by one percent then r should be increase by \[\frac{1}{2}%\]i.e. R = \[\frac{1}{2\times 100}\times 6400=32\ km\]
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