Q.
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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a
Is zero at all times
b
Varies with time
c
Can be non zero but constant in time
d
Cannot be defined for an elliptical orbit
answer is A.
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Detailed Solution
torque = r⇀x F⇀ here r⇀ is always parallel to F⇀
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