Two wires of same material and of same length are stretched between two fixed supports. Wire,{ is thicker than wire B. If the initial tensions are same (TA =TB)  and temperature increases

We know that Young's modulus of a material is given byY= stress  strain =(F/A)(Δl/l)=F.lA⋅Δl F=Y⋅A⋅Δll  or  T=Y⋅A⋅Δll  Given that TA=TB Given that  TA= TB A/issmallerinthickerwire(4) Now consider the effect of heating. The decrease in strain is same and hence the decrease in tension in thicker whe is more than thinner wire. Thus TA decreases more than TB.