A) \[20\text{ }min\]
B) \[7.5min\]
C) \[25min\]
D) All of these
Correct Answer: C
Solution :
The integral form of Gauss law of gravity state \[\underset{\partial v}{\mathop{\oint{\mathbf{g}.d\mathbf{s}}=-4\pi Gm}}\,\] where, \[\partial v\] is any closed surface, ds is a vector whose magnitude is the area of an infinitesimally small piece of surface 3v and whose direction of outward pointing surface is normal, m is the total mass enclosed with in the surface 3v. The left hand side of this equation is called the flux of gravitational field.
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