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According to Kepler’s laws a planet moves in an elliptic orbit with the sun at a focus of the ellipse. Taking the planet and the sun to be point masses, the torque on the planet with respect to sun

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Is zero at all times

Varies with time

Can be non zero but constant in time

Cannot be defined for an elliptical orbit

answer is A.

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Detailed Solution

torque = $\overset{⇀}{r} x \overset{⇀}{F}$ here $\overset{⇀}{r}$ is always parallel to $\overset{⇀}{F}$

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