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Mechanical Properties — Easy JEE physics MCQ

A wire of length $2$ m and cross-sectional area $10^{-6}$ m² stretches by $0.1$ mm under a load of $1$ kg. The Young's modulus is (g = $10$ m/s²):
  1. A. $2 \times 10^{11}$ Pa
  2. B. $1 \times 10^{11}$ Pa
  3. C. $2 \times 10^{10}$ Pa
  4. D. $1 \times 10^{10}$ Pa

Solution

$Y = \frac{FL}{A\Delta L} = \frac{10 \times 2}{10^{-6} \times 0.1 \times 10^{-3}} = \frac{20}{10^{-10}} = 2 \times 10^{11}$ Pa

PHYSICS

easy • PYQ Reworded
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A wire of length 22 m and cross-sectional area 10−610^{-6} m² stretches by 0.10.1 mm under a load of 11 kg. The Young's modulus is (g = 1010 m/s²):
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