A) \[\frac{l}{L-l}\]
B) \[\frac{L}{l}\]
C) \[\frac{l}{L}\]
D) \[\frac{lL}{L+l}\]
Correct Answer: C
Solution :
If \[\mu \]is the mass per unit length then weight of hanging length \[=\mu /g\] Weight of chain on table \[=\mu (L-1)g\] \[R=\mu (L-1)g\] \[f=\mu sR\] \[=\mu s.\mu (L-1)g\] \[{{\mu }_{s}}.\mu (L-1)g=\mu g\]\[\mu =\frac{l}{L-1}\]
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