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AP EAMCET202422 May 2024Evening ShiftPhysicsCurrent ElectricityActual

Resistance of a wire is 8 . It is drawn in such a way that it experiences a longitudinal strain of 400 % . The final resistance of the wire is

Options

  1. A100
  2. B200
  3. C300
  4. D400

Correct answer

B. 200

Step-by-step solution

R ₁=8 , = 1 l ₁ =4 l =4 l ₁ l₂=l₁+81=l₁+4 l₁=5 l₁ Now, resistance of a wire is given by aligned & R ₂ R ₁ = ( l ₂ l ₁ )^2= ( 5 l ₁ l ₁ )^2=25 & R ₂=25 R ₁=25 8=200 aligned

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