A compound bar consisting of material $A$ and $B$ is tightly secured at the ends. The coefficient of thermal expansion of $A$ is

more than that of $B$ . when the temperature is increased the stresses induced will be

- 1
  
  tensile in both the materials
- 2
  
  tensile in material $A$ and compressive in material $B$
- 3
  
  compressive in material $A$ and tensile in material $B$
- 4
  
  compressive in both the materials

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