A-LevelPhysicsDeformation of solids9702/12 · May/June 2011 · Q231 Mark
The behaviour of a wire under tensile stress may be described in terms of the Young modulus E of the material of the wire and of the force per unit extension k of the wire. For a wire of length L and cross-sectional area A, what is the relation between E and k?
AE = A / kL
BE = kA / L
CE = kL / A
DE = L / kA
✓ Correct answer
C: E = kL / A
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