A)
\[l\] B)
\[2l\]
C)
zero
D)
\[l/2\]
Correct Answer:
A Solution :
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\[=2l'=l\]
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