Two identical wires A and B of same material are loaded as shown in figure. If the elongation in wire B is 1.5 mm, what is the elongation (in mm) in A. (Mass of A and B can be neglected)

Question

G1 Physics · Accepted Answer

Use the first law Q=ΔU+W (W by the gas), ΔU=nCᵥΔT for an ideal gas, and the appropriate process relation. For Carnot devices, let T₁ be the cold-reservoir temperature and T₂ be the hot-reservoir temperature; η=1-T₁/T₂ and COP=T₁/(T₂-T₁). Substituting the given values gives 3.