Young's modulus by searle's apparatus

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Homework Help Overview

The discussion revolves around the use of Searle's apparatus for determining Young's modulus of a wire, specifically focusing on the role of the micrometer in this process.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants question the necessity of using a micrometer versus a vernier caliper for measuring wire dimensions and extension. There is also a discussion about the accuracy of the original Searle's design compared to modified versions.

Discussion Status

Some participants are exploring the correct tools for measurement and the implications of using different designs of the apparatus. Guidance has been offered regarding the roles of the micrometer and vernier scale, though no consensus has been reached on the best approach.

Contextual Notes

There is mention of potential confusion regarding the original design of Searle's apparatus and its variations, which may affect the measurements and results.

babita
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Homework Statement



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

2. Homework 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
 

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:confused:Shouldn't a vernier caliper be used?
 
babita said:
:confused:Shouldn't a vernier caliper be used?

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:
oh...thanks :)
 

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