A wire has a cross sectional area A , length L and young s modulus – McqOptions

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1.	A wire has a cross sectional area A , length L and young s modulus Y . It is pulled by a force F which causes a total extension of length l . The force F is so adjusted that the wire is only slowly stretched. Find the work done by the force in pulling the string by a length dx when extension is x (0 > x > l).
A.	stressstrain*volume
B.	(AY/L)xdx
C.	F*l
D.	stress strain
Answer» C. F*l

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