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. `DeltaT=3/2T(Deltar)/r`
B. `DeltaT=3/2T(Deltar)/r`
C. `DeltaT=2/3T(Deltar)/r`
D. `DeltaT=T(Deltar)/r`