passwella.
Menu

JAMB Physics 1999 Question 14

Question 14

Elasticity

If the stress on a wire is 107 N m−2 and the wire is stretched from its original length of 10.00 cm to 10.05 cm. The Young's modulus of the wire is

  1. A.5.0 × 104 N m−2
  2. B.5.0 × 105 N m−2
  3. C.2.0 × 108 N m−2
  4. D.2.0 × 109 N m−2
Show the answer and explanation

Answer: D (2.0 × 109 N m−2)

Explanation

Strain = 0.05/10.00 = 0.005. Young's modulus = stress/strain = 107/0.005 = 2.0 × 109 N m−2.