In which of the following cases is the angular momentum conserved ?

1.	In which of the following cases is the angular momentum conserved ?
Answer» The planet Neptune moves in an elliptical orbit with the sun at one of the foci of the ellipse. An electron DESCRIBES a Sommerfield elliptical orbit round the nucleus. An `alpha`- particle, approaching a nucleus, is scattered by the force of electronstatic repulsion between the two. A boy HURLS a stone TIED to a string ina horizontal CIRCLE. Answer :A::B::C

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