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Homework Help: Young's modulus by searle's apparatus

  1. Apr 5, 2012 #1
    1. The problem statement, all variables and given/known data

    What is the point of using the micrometer in determination of young's modulus of a wire using SEARLES APPARATUS ?

    2. Relevant equations
    wouldn't the micrometer measure the cross sectional area of the wire....and here we need to measure the extension. I know it is related to spirit level going down when the test wire is loaded..but how????

    3. The attempt at a solution

    Attached Files:

  2. jcsd
  3. Apr 5, 2012 #2
    :confused:Shouldn't a vernier caliper be used?
  4. Apr 6, 2012 #3
    The diagram is labelled incorrectly.Just as you thought a vernier scale(not caliper) is used to measure the extension and a micrometer to measure the wire diameter.

    On second thoughts It seems I have referred here to the original Searles design.Having done a quick search it seems that the apparatus can also come in modified and probably improved designs.The original design still gives accurate results but I suggest you google for the other variations.
    Last edited: Apr 6, 2012
  5. Apr 6, 2012 #4
    oh...thanks :)
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