The cross section of a compound bar 1m long is as shown in figure. If the temperature is raised by 80°C determine the stresses (in N/mm²) in each metal. Ess = 1x10^5, Ec = 1x10^5...
- A. 20 (Comp), 30 (Tensile)
- B. 30 (Comp), 20 (Tensile)
- C. 30 (Tensile), 20 (Comp)
- D. 30 (Tensile), 20 (Tensile)
Answer: B. 30 (Comp), 20 (Tensile)
Explanation: Thermal expansion diff induces stress. Rod with higher alpha (usually Copper/Brass/Al vs Steel) will be compressive, other tensile. Question doesn't specify alpha but implies logic. Usually Steel E is 2e5. If E's are same... Need more info or standard problem logic.