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JEE Main201911 Jan 2019Evening ShiftPhysicsThermal Properties of MatterActual

Two rods A and B of identical dimensions are at temperature 30^ C . If A is heated upto 180^ C and B upto T ^ C , then the new lengths are the same. If the ratio of the coefficients of linear expansion of A and B is 4: 3, then the value of T is

Options

  1. A230^ C
  2. B270^ C
  3. C200^ C
  4. D250^ C

Correct answer

A. 230^ C

Step-by-step solution

Change in length in both rods are same i.e. ₁= ₂ ₁ ₁= ₂ ₂ array l ₁ ₂ = ₂ ₁ [ ₁ ₂ = 4 3 ] 4 3 = -30 180-30 array =230^ C

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