A) \[l\]
B) \[2l\]
C) zero
D) \[l/2\]
Correct Answer: A
Solution :
Let us consider the length of wire as L and cross-sectional area A the material of wire has Young's modulus as Y. For 1st case, \[y=\frac{W/A}{l/L}\]\[\left[ \because Y=\frac{stress}{strain}=\frac{F/A}{l/L} \right]\] For 2nd case, \[Y=\frac{W/A}{2l'/L}\] \[\therefore \]\[l'=l/2\] So, total elongation of both sides\[=2l'=l\]You need to login to perform this action.
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