Magnetic field around a finite wire with different diameter

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Discussion Overview

The discussion centers around the behavior of the magnetic field (B) generated by a finite wire carrying a fixed current, particularly focusing on how changes in the wire's diameter affect the magnetic field at a specific point in space. The scope includes theoretical considerations and simulation results.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants propose that changing the diameter of the wire affects the magnetic field at a fixed point, despite the current remaining constant.
  • Others argue that the magnetic field should depend solely on the current and not the diameter of the wire.
  • A participant expresses confusion regarding the disagreement, noting that the length of the wire remains unchanged while only the diameter varies.
  • Concerns are raised about potential measurement errors due to the small scale of the wire and measurement distances.
  • One participant questions how the thick wire was positioned in relation to the thin wire, suggesting that the distance from the measurement point could influence the results.

Areas of Agreement / Disagreement

Participants do not reach a consensus; there are competing views regarding the influence of wire diameter on the magnetic field, and the discussion remains unresolved.

Contextual Notes

Limitations include the small scale of the measurements, potential measurement errors, and the specific conditions under which the magnetic field is being evaluated.

Agnelo
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In my simulation I have a wire with a fixed current flowing, I observed if I change the diameter of the wire the magnetic field (B) in a fixed point of the space also changes, is it correct?
 
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Agnelo said:
In my simulation I have a wire with a fixed current flowing, I observed if I change the diameter of the wire the magnetic field (B) in a fixed point of the space also changes, is it correct?
That does not seem correct, as the magnetic field depends only the current.
 
Yeah, I am agree, only the length affects the measurement, but in this case the length does not change, only the diameter, I don't understand what's wrong...

I have a wire with a 0.05A current over a measurement point at 0.03mm (border of wire), the length of wire is 5.08mm and the diameter is 0.025mm or 0.05mm...
 
Agnelo said:
I have a wire with a 0.05A current over a measurement point at 0.03mm (border of wire), the length of wire is 5.08mm and the diameter is 0.025mm or 0.05mm...

with everything on such a tiny scale, I wouldn't be surprised if it was just measurement error

1) why such small lengths of wire and measurement distance and current ?
2) how are you measuring the B field strength ?
 
Agnelo said:
In my simulation I have a wire with a fixed current flowing, I observed if I change the diameter of the wire the magnetic field (B) in a fixed point of the space also changes, is it correct?

How did you place the thick wire on the same position where the thin wire was? Oh yes, nearest point 0.03 mm from the fixed point ... so part of the thick wire is too far from the fixed point.
 

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