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Question

A wire of length L0 is supplied heat to to raise its temperature by T. If γ is the coefficient of volume ex the wire and Y is the young's modulus of the wire then the energy density stored in the wire is

A
12γ2T2Y
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B
13γ2T2Y3
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C
118γ2T2Y
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D
118 γ2T2Y
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Solution

The correct option is D 118 γ2T2Y
Due to heating the length of the wire increases. Longitudinal strain is produced ΔLL=a×ΔT
Elastic potential energy per unit volume E=12×Stress×Strain=12×Y×(Strain)2
E=12×Y×(ΔLL)2=12×Y×a2×ΔT2orE=12×Y×(γ3)2×T2=118γ2YT2[As γ=3a and ΔT=T(given)]

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