How to measure magnetic field of a magnet

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Discussion Overview

The discussion revolves around methods to measure the magnetic field of a cylindrical neodymium magnet, focusing on experimental approaches and the feasibility of using various instruments for measurement.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested, Experimental/applied

Main Points Raised

  • One participant inquires about how to experimentally determine the magnetic field B at a certain point and seeks a relationship between magnetic fields and forces.
  • Another participant suggests using a Hall probe or Gaussmeter for accurate measurements, noting that these instruments can be expensive.
  • A different participant expresses concern about the economic feasibility of measuring the magnetic field and humorously references a creative, makeshift approach.
  • Another participant proposes a low-cost solution for building a homemade gauss meter and provides a link to a website for further information.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best method for measuring the magnetic field, with some advocating for professional instruments and others exploring DIY solutions.

Contextual Notes

Participants mention the cost and accessibility of measuring instruments, as well as the potential for creative solutions, but do not resolve the practicality or accuracy of the proposed methods.

Who May Find This Useful

This discussion may be of interest to individuals looking for practical methods to measure magnetic fields, including hobbyists, educators, and those involved in experimental physics.

Cspeed
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I have a cylindrical neodymium magnet. I know that the magnetic field varies with distance, but how would I determine the magnetic field B at a certain point, through experimentation? I know how to find the force between two magnets at different distances by balancing out with gravity, but I'm stuck as far as measuring fields. Is there an equation which can relate fields and forces for magnets?
 
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If you want an accurate value you will need to measure the field using e.g. a Hall probe.
Instruments used to measure absolute magnetic field are often called Gaussmeters.
They are however quite expensive.

(a more general name for this type of instruments is magnetometer, although that name can also refer to instruments that measure changes in the magnetic field or relative fields)
 
Then I guess there's no way to do it economically/creatively? What if MacGuyver only had some duct tape, a paper clip, and a magnet and needed to find out the B?
 

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