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# If the period of revolution of an artificial satellite just above the earth's surface is T and density of earth is $\rho$ then $\rho T ^2$

a) is a universal constant $=\large\frac{3 \pi}{G}$

b) is a universal constant $=\large\frac{3 \pi}{2G}$

c) is proportional to radius of earth R

d) is proportional to square of earth's radius $R^2$ where $G=$ universal gravitational constant