Q. A uniform metal chain is placed on a rough table such that one end of chain hangs down over the edge of the table. When one-third of its length hangs over the edge, the chain starts sliding. Then, the coefficient of static friction is
A) $\frac{3}{4}$
B) $\frac{1}{4}$
C) $\frac{2}{3}$
D) $\frac{1}{2}$
Explanation
(d) $\mu_{s} = \frac{Length\ of\ the\ chain\ hanging\ from\ the\ table}{Length\ of\ the\ chain\ lying\ on\ the\ table}$
$= \frac{l/3}{l - l/3} = \frac{l/3}{2l/3} = \frac{1}{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.