Will the angular momentum of a planet be conserved? Justify your answer.

Explanation

Yes, Because
`vec(tau) = vec(r) xx vec(F) = vec(r) xx (-(GM_(S)M_(E))/(r^2) hatr) = 0`
Since `vec(r) = r hat(r), (hat(r) xx hat(r)) = 0`
So, `vec(tau) = (dvec(L))/(dt) = 0`.
It implies that angular momentum `vec(L)` is a constant vector. The angular momentum of the Earth about the Sun is constant throughout the motion.