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NEET2014PhysicsMechanical Properties of SolidsActual

A steel wire of 1 m long and 1 ~mm ^2 cross section area is hanged from rigid end when weight of 1 kg is hanged from it, then change in length will be (Young's coefficient for wire Y=2 10¹¹ ~N / m ^2 )

Options

  1. A0.5 mm
  2. B0.25 mm
  3. C0.05 mm
  4. D5 mm

Correct answer

C. 0.05 mm

Step-by-step solution

Young's coefficient of elasticity Y= m g L r^2 L Substituting the values, we get L=0.05 ~mm

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