Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reaso

Question

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).\ Assertion (A) : The radius vector from the Sun to a planet sweeps out equal areas in equal intervals of time and thus areal velocity of planet is constant.\ Reason (R) : For a central force field the angular momentum is a constant.\ In the light of the above statements, choose the most appropriate answer from the options given below :\

Professor PC Thomas Classes · Answer

(d) : According to Kepler's second law, 
$ \frac{d A}{d t}=\frac{L}{2 m}=	ext { constant } $ 
Due to central force, torque is zero and angular momentum is constant.\