0
$\begingroup$

Since it is "density", I suppose that such values as charge density of a volume region $\rho_v$, charge density of a line $\rho_L$, and charge density of a surface $\rho_S$ is a constant but I sometimes see that people write $\sigma(r)$ to denote charge density and r is the position of that considered density in a space (ex:http://scienceworld.wolfram.com/physics/SurfaceChargeDensity.html) It implies that charge density is a scalar field. So I don't know which one is right. If charge density is a scalar field which means that its value varies as different position then what is the exact definition of density.

$\endgroup$
1
  • $\begingroup$ Have you read the Wikipedia article? If no, please do that. If yes, please ask a more specific question about it. $\endgroup$ – ACuriousMind Feb 2 '15 at 20:22
1
$\begingroup$

Both the uses are correct. Charge density may be uniform or may vary depending on its position making it a function of $r$ and hence $\rho(r) $

It just depends upon how the charge is distributed in the region.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.