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PhysicsNEET 2020Young's, bulk and shear moduli; Poisson's ratio

Mechanical Properties of Solids

A wire of length LL, area of cross-section AA, is hanging from a fixed support. The length of the wire changes to L1L_1 when mass MM is suspended from its free end. The expression for Young's modulus is:

  1. A.MgL1AL\dfrac{MgL_1}{AL}
  2. B.Mg(L1−L)AL\dfrac{Mg(L_1-L)}{AL}
  3. C.MgLAL1\dfrac{MgL}{AL_1}
  4. D.MgLA(L1−L)\dfrac{MgL}{A(L_1-L)}✓

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