[SI-LIST] Re: U and E
- From: Mellberg Hans <htmguy@xxxxxxxxx>
- To: p2rich@xxxxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Wed, 8 Aug 2001 13:57:07 -0700 (PDT)
Er or Relative permitivity is a multiplier for the
absolute permitivity of 8.85 * 10-12 F / M. Er is also
known as the relative dielectric constant of the
material in question. In basic equations, the absolute
value is already absorbed into a constant of the
equation and one only needs to insert the relative
permitivity value. For example, go to UMR's website
(http://www.emclab.umr.edu/pcbtlc/index.html) and
there you will see that you only need to insert the
relative value and not the complete EoXEr value.
The same goes for the relative permeability constant.
I hope this answers your question.
Hans
--- Rich Peyton <p2rich@xxxxxxxxxxxxx> wrote:
>
> Hi All,
>
> In Equations for permattivity (Eo) and permeability
> (uo) I always get the
> two confused! There's also Er and Ur in these
> equations which I input
> dielectric constant? Any SI Gurus have some good
> input on the two?
>
>
> Constants:
> Permattivity ( eo ) = 8.85 * 10-12 F / M
> Permeability ( uo ) = 1.26 * 10-6 H / M
>
> Thanks,
> Rich
>
>
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