Magnetic Induction: Investigating Unmagnetized Pipe

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Discussion Overview

The discussion revolves around the phenomenon of magnetic induction in a long metal pipe that was magnetized using a magnetic coil. Participants explore why the pipe did not exhibit the expected positive and negative ends typically associated with magnetization, considering various factors such as material properties, dimensions, and the parameters of the magnetization process.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Areena notes that the pipe did not develop distinct magnetic poles and suggests several potential reasons, including the material of the pipe, its length, possible flaws, or insufficient voltage/amps used during magnetization.
  • Another participant questions how the charges were determined at specific points on the pipe, indicating a need for clarity on measurement methods.
  • One participant expresses confusion about the relationship between static magnetization and potential difference, suggesting a lack of familiarity with the concept.
  • Areena clarifies that a magnetometer was used to measure DC magnetic fields, but it may not have pinpointed exact charge locations, leading to potential misunderstandings about the measurements.
  • Another participant expresses skepticism about the existence of differing charges on a metal pipe, stating that charges should dissipate and equalize across the surface.
  • A later reply echoes this skepticism, reinforcing the idea that a uniform charge is expected on a conductive material like a metal pipe.

Areas of Agreement / Disagreement

Participants express skepticism regarding the presence of differing charges on the metal pipe, indicating a shared viewpoint on this aspect. However, there is no consensus on the reasons for the lack of distinct magnetic poles or the implications of the measurements taken.

Contextual Notes

Participants discuss various assumptions about the material properties and measurement techniques, but these assumptions remain unresolved and depend on specific definitions and conditions related to the experiment.

Areena
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Hello, I wasn't really sure as to where to post this, since it kinda doesn't really fit in with the listed categories, but I have a question. I work at a chem lab that specializes in Non-Destructive testing, and I am also minoring in Non-Destructive testing in college. In the engineering department, a long metal pipe was magnetized using a large magnetic coil of 120 turns, and it never overlaps itself. Only, the pipe did not develop a negative end and positive end like a magnet. The charges on the pipe are as shown in the attachment picture. I was asked why this is. The only things I could come up with were that it could be the material of the pipe, the length of the pipe, a flaw in the pipe, or the amount of voltage/amps used were too low to magnetize the pipe. The coil used 80 volts, twice that of what the company says is a safe level of voltage to use. No one can seem to figure this out, so hopefully some of you nice smart people can help me determine why this is, or if I am just having a stupid moment, and overlooking something obvious. Anything is appreciated. Thanks!

~Areena
 

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How did you guys determine the charge at specific points on the pipe?
 
Why would the static magnetisation cause a potential differance?
That's new to me.
 
Well, I did not do it, someone in engineering did, but they used a Magnetometer for DC magnetic fields. I do not believe they pinpointed the exact locations of the charges. The picture is just an example of what was found using the meter after magnetization of the pipe.
 
Areena;3313080The picture is just an example of what was found using the meter after magnetization of the pipe.[/QUOTE said:
OK, but the meter was a magnetometer. Right?
It does not measure electrical voltage, rather magnetic strength and polarity.
Perhaps this is the source of confusion.

If not, I'm all ear's.
 
I could see that palladin. I have a hard time believing that there was a difference in charge on a metal pipe. The charges should dissapate and the pipe should be the same charge at all points. Right?
 
Drakkith said:
...I have a hard time believing that there was a difference in charge on a metal pipe...

That is my thought as well.
 

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