Different points in the earth are at slightly different distances from the sun and hence experience different forces due to gravitation. For a rigid body, we know that if various forces act at various points in it, the resultant motion is as if a net force acts on the CM (centre of mass) causing translation and a net torque at the CM causing rotation around an axis through the CM. For the earth-sun system (approximating the earth as a uniform density sphere). (a) the torque is zero (b) the torque causes the earth to spin (c) the rigid body result is not applicable since the earth is not even approximately a rigid body (d) the torque causes the earth to move around the sun
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option a is correct ..
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