Changes

/* The Composition of Physical Structure */
:<math> \tan \delta_m = \mu^{\prime\prime}_r / \mu^{\prime}_r </math>
 
Three special media are frequently encountered in electromagnetic problems:
 
 
{| class="wikitable"
|-
! scope="col"| Medium
! scope="col"| \epsilon_r&epsilon;<sub>r</sub>! scope="col"| \mu_r&mu;<sub>r</sub>! scope="col"| \&sigma ;! scope="col"| \sigma_m &sigma;<sub>m</sub>
|-
! scope="row"| Free Space
| &infin;
|}
 
 
 
* '''Vacuum''' or '''Free Space''': &epsilon;<sub>r</sub> = &mu;<sub>r</sub> = 1 and &sigma; = &sigma;<sub>m</sub> = 0
* '''Perfect Electric Conductor (PEC)''': &epsilon;<sub>r</sub> = &mu;<sub>r</sub> = 1, &sigma; = &infin;, &sigma;<sub>m</sub> = 0
* '''Perfect Magnetic Conductor (PMC)''': &epsilon;<sub>r</sub> = &mu;<sub>r</sub> = 1, &sigma; = 0, &sigma;<sub>m</sub> = &infin;
 
 
Kazem Sabet
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