Talk:Electric flux

Untitled
how to draw the electric lines of force due to two equal point charges kept at some saperation?

Shoudn't the electric field inside the integral be the normal component of the field to the surface?Gp4rts (talk) 01:53, 7 October 2008 (UTC)

OK, the dot product with the surface normal is included in the integralGp4rts (talk) 08:17, 9 October 2008 (UTC)

Yes, but what is it?
What physical phenomenon does flux correspond to? The integral of acceleration is velocity. The integral of ... is flux. I know what velocity is, but I have no idea what flux is after reading this article. — Preceding unsigned comment added by 72.187.99.79 (talk) 19:54, 9 June 2011 (UTC)


 * I always look at it as a measure of the number of electric field lines passing through a surface which is perpendicular to those lines.
 * I'll have a look at editing the page to give a fuller description in a few weeks' time when I'll have some more free time on my hands - unless someone else beats me to it. Hope it helps, anyway! --  Newty   15:59, 10 June 2011 (UTC)

no. to number
Just changed no. to number. 71.139.164.10 (talk) 21:56, 21 September 2012 (UTC)

Phi or Psi ?
Any idea why the Germans use Psi (Ψ) for the electric flux and the English use Phi_e (ΦE)? — Preceding unsigned comment added by 80.74.227.132 (talk) 10:27, 31 May 2013 (UTC)

What ever happened to D
Electric flux has been integrated over 'D', not 'E'. ISO 31 and ASA 1046 gives 'electric flux' as having units 'coulomb', and symbol of [math]\Psi[/math]. I have not found a reference before 1975 using E as the basis of flux, although 'Electromagnetism' (I.S.Grant and W.R.Phillips, Wiley) uses E to form flux. This article would require some discussion on displacement flux, which also goes by this name too. Wendy.krieger (talk) 11:38, 17 January 2017 (UTC).
 * You have D in the macroscopic version. In Maxwell's_equations there is only E. Unless your surface cuts through a dielectric, it should be fine either way, but (in SI units) the units are different. Gah4 (talk) 01:42, 22 February 2022 (UTC)
 * You have D in the macroscopic version. In Maxwell's_equations there is only E. Unless your surface cuts through a dielectric, it should be fine either way, but (in SI units) the units are different. Gah4 (talk) 01:42, 22 February 2022 (UTC)

Simplifying Practical Examples
I think it would be quite useful to explain how electric flux is useful for determining the electric effects of charged bodies that cannot be approximated as a single point in space. We need electric flux because we need to calculate how charged cylinders, cones, etc affect their surroundings and even themselves. CessnaMan1989 (talk) 17:54, 7 October 2021 (UTC)

gaussian units
Can we also explain, maybe near the end, how it works in Gaussian units? Gah4 (talk) 01:42, 22 February 2022 (UTC)