A uniform metal chain is placed on a rough table such that one end of it 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:

Options

A. ` (3)/(4)`
B. ` (1)/(4)`
C. ` (2)/(3)`
D. ` (1)/(2)`

Answer

D

Explanation

` mu = ( F ) / ( R ) = ( mg //3) /( 2mg // 3) = (1)/(2)`