A) 2R/3
B) 4R/3
C) 8R/3
D) R/3
Correct Answer: A
Solution :
[a] Gauss law for gravitation \[\int{\vec{g}.d\vec{s}=-{{\operatorname{m}}_{in}}.4\pi G;g=\frac{GM}{{{R}^{2}}}}\] \[2\times \frac{GM}{{{R}^{2}}}\times A=\frac{M}{\frac{4}{3}\pi {{R}^{3}}}\left( h\times A \right)\times 4\pi G\] \[\Rightarrow h=\frac{2R}{3}\]You need to login to perform this action.
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