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The change in length due to a tensile or compressive force acting on a body is given by (where P = Tensile or compressive force acting on the body, $$l$$ = Original length of the body, A = Cross-sectional area of the body and E = Young's modulus for the material of the body)
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is
What is the thermal conductivity of a perfect heat insulator?