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A metal rod has a length of 100cm at 200℃. At what…

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A metal rod has a length of 100cm at 200℃. At what temperature will its length be 99.4cm if the linear expansivity of the material of the rod is 2×10^(-5) C^(-1)

  • A. 200℃
  • B. 300℃
  • C. 100℃
  • D. -100℃




Now for the right answer to the above question:

  1. Option A is incorrect.
  2. Option B is incorrect.
  3. C is incorrect. be careful with how you handle your signs.
  4. D is the correct answer.


You may please note these/this:

  • Even without going into detailed solution, you should know that the answer must be negative since the rod actually contracted and did not expand.

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/ culled from 2019 JAMB-UTME physics question 4 /

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