Tweakers' Asylum

RE: You might want to read

71.137.148.190

Steve Eddy

In Reply to: RE: You might want to read posted by unclestu on April 04, 2011 at 16:13:57

Faraday. Also check up Lorenz.z laws, too, while you're at it. Gauss also formulated some interesting work too, BTW.

Been there, done that. But reading and understanding are two different things. And you don't show any evidence here of any understanding. You're just spewing names as if they mean something.

se

Follow Ups:

RE: You might want to read - pictureguy 18:56:28 04/08/11 (3)
E and M are part of the unification of forces. You can, in some cases, treat them interchangeably.
Too much is never enough
- RE: You might want to read - Steve Eddy 19:41:34 04/08/11 (2)
  E and M are part of the unification of forces. You can, in some cases, treat them interchangeably.
  
  But not when it comes to shielding.
  
  se
  - RE: You might want to read - pictureguy 23:01:12 04/08/11 (1)
    Could you please explain?
    
    Too much is never enough
    - RE: You might want to read - Steve Eddy 07:35:37 04/09/11 (0)
      Could you please explain?
      
      Sure.
      
      It all depends on the type of source and your distance from the source as it relates to the wave impedance which is the ratio of the E- and H-fields.
      
      In the far field, the wave ratio will essentially be that of free space, or 377 ohms.
      
      The nearfield extends about one sixth of a wavelength from the source and depending on the source, the ratios of the E- and H-fields won't be the same as in the far field.
      
      In the nearfield of a loop antenna, the wave impedance is lower than 377 ohms which means it's predominantly H-field. So magnetic shielding will be more effective than electrostatic shielding.
      
      In the nearfield of a whip antenna, the wave impedance is higher than 377 ohms which means it's predominantly E-field. So electrostatic shielding will be more effective than magnetic shielding.
      
      se

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