A bar of length L and of uniform cross-section are A and second moment of area l is subjected to a pull P. If Young's modulus of elasticity of the bar material is E, the expression for strain energy stored in the bar will be

A bar of length L and of uniform cross-section are A and second moment

1.	A bar of length L and of uniform cross-section are A and second moment of area l is subjected to a pull P. If Young's modulus of elasticity of the bar material is E, the expression for strain energy stored in the bar will be
A.	\[\frac{{{P}^{2}}L}{2AE}\]
B.	\[\frac{P{{L}^{2}}}{2EI}\]
C.	\[\frac{P{{L}^{2}}}{AE}\]
D.	\[\frac{{{P}^{2}}L}{AE}\]
Answer» B. \[\frac{P{{L}^{2}}}{2EI}\]

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A bar of length L and of uniform cross-section are A and second moment of area l is subjected to a pull P. If Young's modulus of elasticity of the bar material is E, the expression for strain energy stored in the bar will be

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