Who Derived the Value of Magnetic Permeability in a Classical Vacuum?

[Luminescent]

Who is credited for deriving the value of magnetic permeabilty in a classical vacuum?
How would one go about sourcing information in relation to such a value?

 

[Hesch]

μ₀ = π * 4E-7. It's just a passed value, that is comfortable.

Say you have a long straight conductor carrying a current = 1 Adc.

In a distance, R = 1 m, you will find H = 1A / 2πR [ A/m ] = 1 / 2π [ A/m ].

To find the B-value, you multiply by μ₀, so

B = 2E-7

which some people regarded as a comfortable value ?

Anyway the value π is not included in the value of B, and B "becomes close to" about 1T in practical applications ( a magnet you know where to buy ).

It's just like 1 meter = a long step.

 

[Luminescent]

μ₀ = π * 4E-7. It's just a passed value, that is comfortable.

Say you have a long straight conductor carrying a current = 1 Adc.

In a distance, R = 1 m, you will find H = 1A / 2πR [ A/m ] = 1 / 2π [ A/m ].

To find the B-value, you multiply by μ₀, so

B = 2E-7

which some people regarded as a comfortable value ?

Anyway the value π is not included in the value of B, and B "becomes close to" about 1T in practical applications ( a magnet you know where to buy ).

It's just like 1 meter = a long step.

when using this value in a research paper who would I give credit to?

 

[Hesch]

Well, mayby the members at some congress have voted as for the factor 4*10^-7.

I think the factor π has just been accepted as ok.

The idea has just been to achieve a practical unit ( Tesla ) with a value about 1. ( for a "normal" magnet ).

 

[Luminescent]

µ0 = 4π×10−7 N / A2 ≈ 1.2566370614...×10−6 H / m or T·m / A or Wb / (A·m) or V·s / (A·m)

So when using any of the above values in a peer review research paper, I would give reference to electromagnetic theory and electromagnatism?

 

[Dale]

You would reference the BIPM brochure on the SI for the definition. http://www.bipm.org/en/publications/si-brochure/

 

[Luminescent]

You would reference the BIPM brochure on the SI for the definition. http://www.bipm.org/en/publications/si-brochure/

Excellent thank you Dale!

 

[Vanadium 50]

If you had taken the advice PF had given you, you would be reading journals, and you would have all the citation examples you could use.

 

[Drakkith]

Thread closed.