Young's modulus of a wire is 2 × 10 11   N   m - 2 . If an external stretching force of 2…

Young's modulus of a wire is 2×1011 N m-2. If an external stretching force of 2×1011 N is applied to a wire of length L, the final length of the wire is (cross-section=unity)
  1. 2L
  2. 1.5L
  3. 3L
  4. 1.25L

Solution

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

Asked in: AP EAMCET 2021 (19 Aug Shift 2)

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