Two small satellies move in a circular orbits around the earth, at disatnce `r` and `(r + dr)` from the centre of the earth. Their time periods of rotation ate `T` and `T + dT (Delta r lt lt r, DeltaT lt lt T)`. Then
A. `Delta T = (3)/(2)T(Delta r)/(r)`
B. `Delta T = -(3)/(2)T(Delta r)/(r)`
C. `Delta T = (2)/(3)T(Delta r)/(r)`
D. `Delta T = T(Delta r)/(r)`
