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MHT CET202019 Oct 2020Morning ShiftPhysicsMechanical Properties of SolidsActual

A thick brass wire of length ' L ' and density ' ' is suspended from rigid support. Due to its own weight, ' ^ is the increase in length. Young's modulus ' Y ^ of brass wire in terms of density is ( g = acceleration due to gravity )

Options

  1. AY = gL 4
  2. BY = gL ² 4
  3. CY = gL 3
  4. DY = gL ²

Correct answer

D. Y = gL ²

Step-by-step solution

Y=(F / A) (L / L) ( L=l)= M g L A L = g L² l ( M= A l) (option 4 incorrect)

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