A) \[40\times {{10}^{8}}N/{{m}^{2}}\]
B) \[20\times {{10}^{8}}N/{{m}^{2}}\]
C) \[10\times {{10}^{8}}N/{{m}^{2}}\]
D) \[5\times {{10}^{8}}N/{{m}^{2}}\]
Correct Answer: B
Solution :
Young?s modules =\[\frac{\text{stress}}{\text{strain}}\] As the length of wire get doubled therefore strain = 1 Y = strain = 20 ×108 N/ m2
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