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In Reply to: RE: Do you have a reference posted by unclestu on April 06, 2011 at 14:44:33
to your statement that quartz has no electrical or magnetic effects?
Here's what I actually said:
Since crystals aren't electrically conductive to any degree and have no permeability to speak of, their effects with regard to H-field interference will be virtually nill.
Just wondering,. because I can find reference in a standard electrical engineering text about the magnetic properties of all materials, but you have stated that quartz can have no affect at all.
Great. Then get out your "standard electrical engineering text" and tell us what the relative permeability of quartz is.
Because I have several myself as well as texts specifically relating to the electrical properties of materials. None of them give the relative permeability of quartz. Nor do any Google searches turn up anything.
Here's why.
Quartz is diamagnetic.
However the most diamagnetic material outside of a superconductor is bismuth. And even then bismuth is only VERY VERY weakly diamagnetic. For all intents and purposes, it's about as effective as air at shielding from magnetic fields, save for eddy current losses due to the fact that bismuth is a conductor rather than an insulator as quartz is.
So as I said, their effects as far as H-field interference goes is virtually nill.
se
Follow Ups:
Same thread you state quartz has no magnetic properties at all.
"Virtually nil" seems to be a highly subjective statement, at least in my thinking. I stated the permeability, but now you are stating it is negligible. Now what numerical measurement is significant for you? At what point does the human ear distinguish any change? If you can not answer that question then you have no means of determining what is negligible. Just because a number is numerically small does not mean it may be negligible.
After all, in the medical field there are drugs which can affect the human body in what could be deemed negligible amounts (amount of plutonium to kill you for example,as taken from the headlines).
Stu
Same thread you state quartz has no magnetic properties at all.
No, I did not.
"Virtually nil" seems to be a highly subjective statement, at least in my thinking.
When you're talking about magnetic properties on the order of that of air, then I think it's safe to call such magnetic properties "virtually nil."
I stated the permeability, but now you are stating it is negligible.
No, you didn't state the permeability. You simply said the book said it was similar to that of copper. And didn't mention the permeability of copper either.
The relative permeability of a vacuum is 1.
The relative permeability of copper is 0.999994.
The relative permeability of sapphire is 0.99999976.
Now what numerical measurement is significant for you? At what point does the human ear distinguish any change?
A change in what exactly?
se
your post earlier in this same thread where you refer to a wikipedia entry.
Stu
your post earlier in this same thread where you refer to a wikipedia entry.
In that post I said crystals had "no permeability to speak of."
That's NOT the same as saying they have absolutely NO permeability. Only that it is very very small. So small that it doesn't warrant any mention.
You seem to have problems with comprehension, which would explain why you came up with the erroneous notion that permeability was measured in Webers per meter per second.
se
is a subjective statement. The text gives the permeability of Germanium, a crystal as being about the same as copper.
Where is your text and statement? You criticize but present no backing for your statements.
Stu
The text gives the permeability of Germanium, a crystal as being about the same as copper.
And the permeability of copper is, for all intents and purposes, about the same as air.
se
It is significantly higher being a solid.
Also have you examined the units used to measure permeability? Webers per square meter per second. A Weber is equivalent to a Tesla. That's a huge unit. The only speaker I know that measures its magnetic field in Teslas is the neodymium magnet Lowthers.
Stu
It is significantly higher being a solid.
No, it's not. Copper's permeability is measured as a solid. As I said previously, copper's relative permeability is 0.999994. For all intents and purposes, no better than air.
Also have you examined the units used to measure permeability?
Yes, I have.
Webers per square meter per second.
*BZZZZZZZZZZZT!*
Wrong.
The SI unit for permeability is Henries per meter (H/m).
The Weber is the unit for magnetic flux.
You simply don't have a clue what you're talking about.
se
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