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  4. The torque on a planet about the centre of sun is

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Q. The torque on a planet about the centre of sun is

Gravitation

Solution:

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Force of gravity is acting on the planet,
Torque of force of gravity $=\vec{r} \times \vec{F}_{g}=r F_{g} \sin \theta$
Since $\theta=180^{\circ}, \tau=0$