Mechanical Properties of Solids

'Young's modulus' is defined as the ratio of

• hydraulic stress and hydraulic strain

• shearing stress and shearing strain

• tensile stress and longitudinal strain

• bulk stress and longitudinal strain

A piece of copper is to be shaped into a conducting wire of maximum resistance. The suitable length and diameter are respectively

• 2L and d/2

• L/2 and 2d

• L and d

• 2L and d

The load versus elongation graph for four wires of the same materials is shown in the figure. The thinnest wire is represented by the line

• OC

• OD

• OA

• OB