A wire of length L and cross sectional area A is made of a material of Young’s modulus Y. If the wire is stretched by an amount x, the work done is………..
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Work done = 12×12× stress ×× strain ×× volume
=12=12×Y×(strain)2×Volume×Y×(strain)2×Volume
=12=12×Y×(xL)2×Y×(xL)2×AL×AL
=Yx2A2L
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