On 10/30/2024 10:09 AM, Alan Grayson wrote:
On Wednesday, October 30, 2024 at 5:18:26 AM UTC-6 John Clark wrote:
On Wed, Oct 30, 2024 at 1:17 AM Alan Grayson <[email protected]>
wrote:
/> What are you measuring that you call permeabiliy and
permativity? AG /
*Permeability is a measure of how easily a material (or a vacuum)
allows a_magnetic_ field to be established within it, and
permittivity is a measure of how easily amaterial allows an
_electric_ field to be established within it. For the numerical
values of the vacuum, neither value can be found by theory alone,
but both values were found by experimental means in the 19th
century. And if you know the permeability (μ₀) and permittivity
(ε₀) of the vacuumthen you can calculate the speed of light
because **Maxwell gave us a simple formula for doing so:*
*
*
*c = 1/√(μ₀ε₀)*
**
*What I'd like to know is how EM wave motions can exist absent a
medium which was thought to be necessary for it to be manifested. IOW,
when repeated MM experiments had null results, what model was
developed, if any, to explain the existence of EM wave motions? AG
*
I'm always curious about people who ask "how" questions. Like how does
mass make a gravitational field? I wonder what you would consider a
possible answer to your question?
Brent
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