AP EAMCET · PHYSICS · Mechanical Properties of Solids
Young's modulus of a wire is . If an external stretching force of is applied to a wire of length , the final length of the wire is (cross-sectionunity)
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- B
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- D
Answer & Solution
Correct Answer
(A)
Step-by-step Solution
Detailed explanation
Given, Young's modulus of wire =2×1011 Nm-2 Y=stressstrain=FA×L∆L ⇒1=∆LL ⇒1+1=∆LL+1 ⇒2=∆L+LL ⇒∆L+L=2L
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