ΔQ=msΔT8.1×102=0.1×900×ΔTΔA=A02αΔ T=2.0×10−6 m2
JEE Main 2025 — Physics Thermodynamics
Consider a rectangular sheet of solid material of length ℓ=9 cm and width d=4 cm. The coefficient of linear expansion is α=3.1×10−5 K−1 at room temperature and one atmospheric pressure. The mass of sheet m=0.1 kg and the specific heat capacity Cv=900 J kg−1 K−1. If the amount of heat supplied to the material is 8.1×102 J then change in area of the rectangular sheet is :-
Held on 4 Apr 2025 · Verified 6 Jul 2026.
2.0×10−6 m2
3.0×10−7 m2
6.0×10−7 m2
4.0×10−7 m2
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