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JIPMER 2014
Exam
JIPMER
Year
2014
Subject
Physics
Chapter
Mechanical Properties of Solids

JIPMER 2014 · Physics · Mechanical Properties of Solids

A steel wire of 1 m long and 1 ~mm^2 cross section area is hanged...

A steel wire of 1 m long and 1 mm21 \mathrm{~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/m2Y=2 \times 10^{11} \mathrm{~N} / \mathrm{m}^2)

Options

  1. A0.50.5 mm
  2. B0.250.25 mm
  3. C0.050.05 mm
  4. D55 mm

Correct answer

C. 0.050.05 mm

Step-by-step solution

Young's coefficient of elasticity Y=mgLπr2ΔLY=\frac{m g L}{\pi r^2 \Delta L} Substituting the values, we get ΔL=0.05 mm\Delta L=0.05 \mathrm{~mm}
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