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MHT CET202020 Oct 2020Evening ShiftPhysicsMechanical Properties of SolidsActual

A wire of Young's modulus 1 6 10¹² ~N / m ² is stretched by a force so as to produce a strain of 2 10⁻⁴ . The energy density of the wire is

Options

  1. A3 2 10⁴ ~J / m ³
  2. B3 2 10⁸ ~J / m ³
  3. C1 6 10³ ~J / m ³
  4. D6 4 10³ ~J / m ³

Correct answer

A. 3 2 10⁴ ~J / m ³

Step-by-step solution

Energy =1 / 2 Y ( Strain )²=1 / 2 1.6 10¹² 4² 10⁻⁸=3.2 10⁴ .

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