Hi Andrew,

That seems correct to me, but don't forget that the permeability
here is not relative permeability, but absolute permeability. So, for air
it should be 1.26x10^-6.A second thing to remember is that this answer
will then be in Webers/meter^2, which, IIRC, is Teslas, not Gauss. You
need to multiply by 10000 to get Gauss.

Sean


On Thu, 26 Jul 2001, Andrew Seddon wrote:

> Hi all..
>
> Prehaps somebody could help me working out the following, I`ve done it
> myself but I keep getting results that just don`t look right.
>
> There is a coil that is producing a magnetic field strength(H) of 25.8
> dBuA/m at 10 m. I make this 0.000381 A/m. I want to then convert this to
> flux density(B) in Gauss. So as I understand it the formula is.
>
> Flux Density(B) = Field Strength(H) x Permability of Material.
>
> I work this out using the permability of air and don`t seem to get the right
> answer.
>
>
> In case anybody is wondering i`m trying to work out if it`s possible to
> detect a certain coil at 10m using a hall effect sensor.
>
>
> Any help appreciated.
>
>
>
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