Stress developed in the stretched copper wire is 6×105N/m2. If young's modulus of copper wire is 1.2×1011N/m2, find the energy stored per unit volume in the stretched wire.
A
0.5J/m3
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B
1.5J/m3
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C
2.5J/m3
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D
3J/m3
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Solution
The correct option is B1.5J/m3 We know, energy stored per unit volume in a wire is given by ∴ΔU=12×(stress)×(strain) ⇒ΔU=12×(stress)2Y[∵Y=stressstrain] ⇒ΔU=12×(6×105)21.2×1011 ⇒ΔU=1.5J/m3