MaxwellEquationsInMedia

MaxwellEquationsInMedia - Maxwell equations in media...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Maxwell equations in media Maxwell equations in this case can be modified by including to and j charges and currents inside atoms. In this case fields (so-called microscopic fields) are changing on microscopic scales comparable with atomic size and number of sources is too large. It is possible to simplify this picture if we take into account that a detailed behavior of microscopic fields with their drascic changes on atomic scales is not relevant for macroscopic observations. It is sufficient to use macroscopic description of EM waves by using averaged quantities – macroscopic fields and macroscopic sources. As a result it is possible to write Maxwell equations in a media in the form t D j H S C dA n D t I l d H (1) t B E S C dA n B t l d E (2) D x d dA n D V S 3 (3) B S dA n B (4) Here E and B are averages of the corresponding microscopic quantities mic E E , mic B B . Two new fields D (so-called electric displacement) and H usually called magnetic field, B is now called magnetic inductance. Both D and H include electric and magnetic moments induced by E and B fields and averaged over distances large in comparison with molecule (atomic) size. In a medium D and H fields are related to E and B fields through polarization and magnetization . Polarization or dipole moment density is defined by : p N x P ) ( (5) p is the dipole moment of a molecule in the medium. Average is taken over a small volume centered at is the dipole moment of a molecule in the medium....
View Full Document

This note was uploaded on 09/19/2011 for the course PHYS 4d taught by Professor Staff during the Winter '08 term at UCSD.

Page1 / 9

MaxwellEquationsInMedia - Maxwell equations in media...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online