Question

The diagram shown above represents the applied force per unit area with the corresponding change $X$ (per unit length) produced in a thin wire of uniform cross-section in the curve shown. The region in which the wire behaves like a liquid is :

• A. $ab$
• B. $bc$
• C. $cd$
• D. $Oa$

Answer 1

The correct option is B $bc$

The wire starts behaving like a liquid at point b. It behaves like a viscous liquid in the region bc of the graph because for a liquid, pressure versus volumetric compression has negative slope. ($Bulkmodulus=-V\frac{dP}{dV}$. Note the minus sign.)