A board is balanced on a rough horizontal semicircular log. Equilibrium is obtained with the help of addition of a weight to one of the ends of the board when the board makes an angle $\theta$ with the horizontal. Coefficient of friction between the log and the board is
- A$\cos \theta$
- B$\tan \theta$
- C$\cot \theta$
- D$\sin \theta$
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- [AIIMS 2019]
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