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                                    A board is balanced on a rough horizontal semicircular log. Equilibrium is obtained with the help of addition of a weight on the board, when the board makes an angle θ with the horizontal. Coefficient of friction between the log and the board is: | 
                            
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Answer»  A board is balanced on a rough horizontal semicircular log. Equilibrium is obtained with the help of addition of a weight on the board, when the board makes an angle θ with the horizontal. Coefficient of friction between the log and the board is:    | 
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