A spherical part of radius $R/2$ is excavated from the asteroid of mass $M$ as shown in the figure. The gravitational acceleration at a point on the surface of the asteroid just above the excavation is
A spherical part of radius $R/2$ is excavated from the asteroid of mass $M$ as shown in the figure. The gravitational acceleration at a point on the surface of the asteroid just above the excavation is
- A
$\frac{{GM}}{{{R^2}}}$
- B
$\frac{{GM}}{{2{R^2}}}$
- C
$\frac{{GM}}{{8{R^2}}}$
- D
$\frac{{7GM}}{{8{R^2}}}$
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