Re: [Phys-l] grounding and shielding

[John Denker <jsd@av8n.com>]

On 03/29/2008 02:11 PM, Bernard Cleyet wrote:

>  by using a broadly  resonant loop (low Z) is  
> the H (B) probe immune to E field?

It depends:

a) At any given frequency, resonance amplifies the thing you 
aren't looking for (e.g. E) just as much as it amplifies the 
thing are looking for (e.g. B).

b) Sometimes you get lucky and the two dominant sources of
interference are at different frequencies.

b') On the other hand, sometimes the dominant sources are
the 60Hz E-field from fluorescent light tubes, and the 60Hz 
B-field from the fluorescent light ballast ... in which case
frequency selection isn't going to help.

c) At high frequencies, there is no such thing as a capacitor
or an inductor;  there is no such thing as electrostatics or
magnetostatics.  It's all dynamics.