Talk:Biot–Savart law

message: I reestablished the version of 12 May 2012
because later versions where corrupted.  It seems as if 151.135.188.206 was trying to edit the page, but he corrupted it.
(Lejarrag, May 20, 2012)  — Preceding unsigned comment added by Lejarrag (talk • contribs) 15:41, 20 May 2012 (UTC)
replies: text: Nice, and thanks. Those IP's were fiddling around unecerssarily, and in cases blanking and obliterating. In addition I cleaned up the notation. F = q(E+v×B) ⇄ ∑ici 17:12, 20 May 2012 (UTC)
thread_title: Reset older version

message: I have already just made some changes now. But... 
* To my despair this article is written in the corny 2nd person "To apply the equation, you choose a point in space at which you want to compute the magnetic field. Holding that point fixed, you integrate over the path of the current(s) to find the total magnetic field at that point." It will be removed.
* Right now there is no indication that the integrals are line integrals in the equations. I'll modify that now. 
* Also there is a contradictory notion of the "magnetic constant", initially it says μ0 is the constant (permeability of free space), but later says K_m = \mu_0/4\pi is the magnetic constant. I know I’m kicking up too much of a fuss for nothing, but is it actually a convention to use Km in parallel with Coloumb's constant k=1/4\pi\epsilon_0? I've never seen it before... It will just be removed. If it is conventionally used then reinstate it (preferably with a referance so future pernickity editors like me will not go through this again).
Hope the edits are fine, and no one minds the fabulous colour boxes (Maschen - if you are reading this you will be proud of you're most succesful WP creation. I have used this all over the place, including this article). =) --  F = q(E + v × B) 00:30, 23 February 2012 (UTC)
thread_title: edits all the way..

message: its not very nice now  — Preceding unsigned comment added by 83.134.175.203 (talk) 23:13, 29 October 2012 (UTC)
replies: text: It has been fixed :-) --Steve (talk) 00:24, 30 October 2012 (UTC)
thread_title:  somebody damaged the sidebar thing, .... 

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thread_title:  External links modified 

message: This article might be too high-level for this image, but I just made it for Wikiversity formula sheet.--Guy vandegrift (talk) 00:21, 28 February 2018 (UTC)
replies: text: Nice! I'd be happy if you posted it. (But the caption should be written in English.) --Steve (talk) 20:49, 28 February 2018 (UTC)

text: The quantity in the denominator should be absolute value squared.Constant314 (talk) 21:08, 28 February 2018 (UTC)
replies: text: Thanks for taking it.  It's yours to edit as you please. I will get back to wikiversity:OpenStax equations/University physics/V2.--Guy vandegrift (talk) 01:27, 1 March 2018 (UTC)

text: I need the vector arrow symbols for OpenStax.  Also, it would not be easy to create bold-faced symbols on Inkscape.  But I can place a variation of the image with primes on commons for this article.  Would adding primes but keeping the vector symbols be OK? --Guy vandegrift (talk) 02:32, 1 March 2018 (UTC)
replies: text: Not sure what you mean about the vector symbols, but I think they are OK, if you mean what I think you mean.Constant314 (talk) 02:40, 1 March 2018 (UTC)
replies: text:  is this better?
No prime on the l or the B.  Constant314 (talk) 03:39, 1 March 2018 (UTC)

text: When doing calculations by hand the underscores are great because they are quicker and take less space. They also let you write rank-2 tensors by using two underscores.  But I will remove them.--Guy vandegrift (talk) 06:15, 1 March 2018 (UTC)
replies: text: I just discovered that there is a way to boldface the ell.  It is a unicode character that Inkscape can render as an object that can have a border.---Guy vandegrift (talk) 06:43, 1 March 2018 (UTC)
replies: text: I believe that's it.  I'll look at it again tomorrow.  Constant314 (talk) 07:07, 1 March 2018 (UTC)
thread_title:  An upgraded image you might wish to use 

message: I believe that this remark "where A and B are the (signed) angles between the line and the two ends of the segment" is not correct. A and B should be the (signed) angles between the (vortex) line segment and the connection lines from the segment ends to the point (at which the induced velocity is calculated). This is not what is now stated. I recommend to check this.  — Preceding unsigned comment added by Rschmehl (talk • contribs) 07:14, 7 November 2018 (UTC)
thread_title:  Formulation of Biot-Savart law for vortex segments of finite length unclear, probably wrong 

message: The Biot-Savart law presented here is an integral. But the way I learned it, the integral was derived from a simpler expression of the law in its differential form:
 d\mathbf{B}(\mathbf{r}) = \frac{\mu_0}{4\pi} \frac{I \, d\boldsymbol \ell\times\mathbf{r'}}{|\mathbf{r'}|^3}
(Actually, the professor didn't express it in vector form, so it was more like this:
 dB (r) = \frac{\mu_0}{4\pi} \frac{dI}{r^2}
I think he did it this way so it looked more like a familiar inverse square law. So I'm guessing I got the vector form right.)
I wonder if it would make sense to present the differential form first, then show what the derived integral looks like. If not, I think it still makes sense to present the differential form somewhere. –MiguelMunoz (talk) 11:11, 23 June 2020 (UTC)
thread_title:  Alternate Representation