Talk:Weber (unit)

Untitled

The page says, "if the current flowing through a loop changes, it will induce a magnetic field." I think this is incorrect. Don't static currents induce magnetic fields? --Smack (talk) 05:41, 28 Mar 2005 (UTC)

It's not very clear in the article but "a changing current induces a magnetic field" does not exclude "a static current induces a magnetic field" too. In fact, from $\nabla \times \mathbf {H} =\mathbf {J} +{\frac {\partial \mathbf {D} }{\partial t}}$we see that any current $\mathbf {J}$, static or otherwise, not negated by the effects of the (usually negligible) displacement current $\partial \mathbf {D} /\partial t$, will give rise to a non-zero curl of $\mathbf {H}$, implying that $\mathbf {H} =\mathbf {B} /\mu$ is non-zero. Md25 08:17, 13 Apr 2005 (UTC)

I think that it's much more than "not very clear". If it had read, 'a magnetic field', then you would have been correct. However, what is the significance of the stipulation of a changing magnetic field, if not the exclusion of a static magnetic field?

P.S. My physics text used 'B' and 'E' for electic and magnetic fields. Do 'H' and 'D' belong to some non-SI system of units? --Smack (talk) 04:50, 15 Apr 2005 (UTC)

B is sometimes called magnetic field, but is more appropriately called magnetic flux density, whereas H is in fact the magnetic field. E is the electric field, while D is the confusingly-named electric displacement field. --Laura Scudder | Talk 01:50, 28 Apr 2005 (UTC)

Magnetic flux density redirects to magnetic field density, which says that they're the one and the same. --Smack (talk) 01:52, 30 Apr 2005 (UTC)

Yeah, I said it's confusing and inconsistent. Most intro classes never need to use H because they don't work in materials, and so call B the magnetic field, but as soon as you're within a material, a physicist would call H the magnetic field (historically because that's what instruments measure). --Laura Scudder | Talk 20:44, 4 May 2005 (UTC)

SI multiples

Is the SI multiples table really necessary? It's not as though the SI prefixes apply just to webers, they apply to all SI units; other articles on SI units don't carry this table. The table highlights that milli-, micro-, and nano-weber are the most common multiples used, which may be worth mentioning in the article (perhaps?), but the table as a whole seems superfluous. 90.209.4.167 (talk) 14:19, 12 April 2009 (UTC)

IPA

Shouldn't we mention the name Weber is pronounced [veːbɛʁ]? --79.199.69.200 (talk) 13:25, 7 September 2009 (UTC)

Weber vs Tesla

Isn't the first sentence wrong? The unit of flux density B is the Tesla, as stated in magnetic flux density, where it also says one Tesla is one Weber per square meter (1T = 1Wb/m^2). A "flux density of 1 Wb" is incorrect. The sentence should read: "a flux of 1 Wb is 1T*m^2", or more explicitly, " a flux density B through an area of 1m^2 gives a flux of 1Wb". Note also the inconsistency with the lower paragraph on derived units. El perseguidor (talk) 17:48, 22 October 2013 (UTC)

terminology "loop"

"The weber may be defined in terms of Faraday's law, which relates a changing magnetic flux through a loop to the electric field around the loop." The loop that is being referred to if I understand correctly if just a closed circuit of conductive wire?

This could be clarified a bit but is generally indicative. — Preceding unsigned comment added by S.mielnik (talk • contribs) 08:27, 10 June 2015 (UTC)

unit pole

in the Guide for the Use of the International System of Units (SI) 2006, table B.8, there is listed a unit pole = 1.256 637 E−07 Wb. I cannot find this unit and description anywhere else. Ra-raisch (talk) 15:24, 25 September 2017 (UTC)

Malicious damage

Placing "N = Newton" in the chart of UNITS is malicious damage to the site? Good grief! So its not in the equation above, it is a very important item in physics and some layman at some point might wonder what an "N" is. — Preceding unsigned comment added by 108.36.71.119 (talk) 19:10, 2 April 2020 (UTC)

I never said your edit was malicious. As I explained in my edit summary, the list of units exists specifically to define the symbols used in the equation

$\mathrm {Wb} ={\dfrac {\mathrm {kg} {\cdot }\mathrm {m} ^{2}}{\mathrm {s} ^{2}{\cdot }\mathrm {A} }}=\Omega {\cdot }{\text{C}}=\mathrm {V} {\cdot }\mathrm {s} =\mathrm {H} {\cdot }\mathrm {A} =\mathrm {T} {\cdot }\mathrm {m} ^{2}={\dfrac {\mathrm {J} }{\mathrm {A} }}=10^{8}\mathrm {Mx}$

and as such is not a generic list of physical units. I don't want to discourage you from making good faith edits; occasional disagreements with other editors are inevitable and should not be taken personally. MaxwellMolecule (talk) 20:52, 2 April 2020 (UTC)

OK, explanation accepted. Thanks. — Preceding unsigned comment added by 108.36.71.119 (talk) 17:42, 3 April 2020 (UTC)