railway RRB JE (CBT I + CBT II) Mock Test 2024 Strength of Materials Simple Stress and Strain Axial Elongation of Bar
A tensile load (P) acts on an axial member of length (l) and cross-sectional area (A) such that it undergoes extensions. If (E) is the elastic modulus the axial stiffness is :
1
\(\rm \frac{PE}{l}\)
2
\(\rm \frac{PA}{l}\)
3
\(\rm \frac{EA}{l}\)
4
\(\rm \frac{Pl}{A}\)