A rope lies on a table such that a part of it hangs down the table. When the length of hanging p...

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A rope lies on a table such that a part of it hangs down the table. When the length of hanging part is \( 1 / 3 \) of entire length the rope just begins to slide. The coefficient of friction between the rope and the table is :-
(1) \( 2 / 3 \)
(2) \( 1 / 2 \)
- (3) \( 1 / 3 \)
(4) \( 1 / 6 \)
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