Explanation
Area of hysterisis loop gives the energy loss in the process of stretching and unstretching of rubber band and this loss will appear in the form of heating.
At point b, yielding of material starts.
Elasticity of wire decreases at high temperature i.e., at higher temperature slope of graph will be less. So, we can say that T1 > T2
Because the stretching of coil simply changes its shape without any change in the length of the wire used in coil. Due o which shear modulus of elasticity is involved.
When a spring balance has been used for a long time, the spring in the balance gets fatigued and there is loss of strength of the spring. In such a case, the extension in the spring is more for a given load and hence the balance gives wrong readings.
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