Please check my calculation of the resistance of this wire shape

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Homework Help Overview

The discussion revolves around calculating the resistance of a wire shaped in a particular form, with participants examining the geometry involved, specifically whether a section of the wire can be considered a semicircle based on a provided diagram.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the formula for resistance and question the shape of the wire, particularly the identification of a semicircular section. There is also a focus on clarifying the dimensions mentioned in the problem.

Discussion Status

The conversation is ongoing, with participants providing corrections and interpretations of the diagram. Some guidance has been offered regarding the assumptions about the semicircle, but no consensus has been reached on the exact nature of the wire's shape.

Contextual Notes

There are discrepancies in the dimensions provided, specifically between the radius mentioned in the text and what is depicted in the diagram. Participants are also navigating language barriers that may affect their understanding of the problem.

requied
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Homework Statement
I know the formulas about resistance of a cylindrical shape copper wire, and applied those on the question but I don't know that whether I am on the right track.
Relevant Equations
R = ρ.L/A
I explained what I want to tell you in the picture I add. Thanks in advance.
 

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Your formula is a little off, it should be ##R = \frac{\rho L}{A}##.

Is your question how to calculate the length of the semicircle?
 
etotheipi said:
Your formula is a little off, it should be ##R = \frac{\rho L}{A}##.

Is your question how to calculate the length of the semicircle?
Thank you for correcting I will edit this, I want to write this actually. So, I don't know the second one is a semicircle or not. If that is I did correct. I don't have a question actually, mine is a confirmation.
 
requied said:
I don't know the second one is a semicircle or not.
It's not drawn very well, but if they don't say otherwise, it looks close enough to a semicircle to consider it one, IMO.
 
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berkeman said:
It's not drawn very well, but if they don't say otherwise, it looks close enough to a semicircle to consider it one, IMO.
thank you I had also thought so
 
It's not drawn well at all. A radius of 25 mm is mentioned in the text but a radius of 4500 mm is shown for the supposed cylindrical piece. This figure looks like one that might ask for the magnetic field at the center of the semicircle.
 
kuruman said:
It's not drawn well at all. A radius of 25 mm is mentioned in the text but a radius of 4500 mm is shown for the supposed cylindrical piece.
I think the "25mm" is the radius of the wire itself, not the radius of the semicircle portion of the wire form. Yeah, that confused me pretty well also.
 
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berkeman said:
I think the "25mm" is the radius of the wire itself, not the radius of the semicircle portion of the wire form. Yeah, that confused me pretty well also.
Ah, yes!
 
berkeman said:
I think the "25mm" is the radius of the wire itself, not the radius of the semicircle portion of the wire form. Yeah, that confused me pretty well also.
My native language is not English. See it from my angle 😅
 

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