A uniform, slender cylindrical rod is made of a homogeneous

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A uniform, slender cylindrical rod is made of a homogeneous and isotropic material. The rod rests on a frictionless surface. The rod is heated uniformly. If the radial and longitudinal thermal stresses are represented by σr and σ_z respectively, then

1. σ_r = 0, σ_z = 0
2. σ_r ≠ 0, σ_z = 0
3. σ_r = 0, σ_z ≠ 0
4. σ_r ≠ 0, σ_z ≠ 0

Correct Option: A

Rod is not restrained but completely free