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JAMB Physics 2011 Question 14

Question 14

Elasticity

A copper wire was subjected to a tensile stress of 7.7 × 107Nm−2. Calculate the tensile strain of the wire. [Young modulus = 1.1 × 1011Nm−2]

  1. A.7.0 × 10−4
  2. B.2.2 × 10−4
  3. C.2.0 × 10−5
  4. D.7.0 × 10−3
Show the answer and explanation

Answer: A (7.0 × 10−4)

Explanation

Strain = stress ÷ Young modulus = 7.7 × 107 ÷ 1.1 × 1011 = 7.0 × 10−4.