Question

A heavy urn form chain lies on horizontal table top.If the coefficient of friction be one the table surface is 0.25, then the maximum fraction of the length of the chain that hang edge of the table is :

• A. $20\%$
• B. $25\%$
• C. $35\%$
• D. $15\%$

Answer 1

The correct option is B $25\%$

length$\frac{M}{L}$

$\mu =0.25$

$\mu N=l\times \frac{M}{L}\times g$

$\mu \times \frac{M}{L}\times \left(L-l\right)\times g=l\times \frac{M}{L}\times g$

$=0.25\times \left(L-l\right)=l$

$or,0.25L-0.25l=l$

$or,l\left(0.25+1\right)=0.25L$

Hence,

option $\left(B\right)$ is correct answer.