# Please check my calculation of the resistance of this wire shape

## 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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etotheipi
Gold Member
2019 Award
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?

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.

berkeman
Mentor
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.

requied
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

kuruman
Homework Helper
Gold Member
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.

berkeman
Mentor
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.

kuruman
kuruman