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MHT CET202015 Oct 2020Morning ShiftPhysicsThermal Properties of MatterActual

A steel wire of length 'L' and area of cross-section 'A' is suspended from rigid support. If ' Y ^ is the Young's modulus of material of the wire and ' ' is the coefficient of linear expansion, then the increase in tension when temperature falls by t^ C is

Options

  1. AYA t
  2. BYA t
  3. CY t
  4. DL t Y

Correct answer

B. YA t

Step-by-step solution

Let F be tension developed in the wire. Y = F / A L / L As L = La T Y = F Aa T or F = Y Aa T

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