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Re: Displacement Current Revisited
On 03/25/99 23:04:24 you wrote:
>
>Original Poster: Bryan Kaufman <bryan-at-apexrad-dot-com>
>
>Is this for DC coils or do AC coils have a "rectifier" effect?
>
>Bryan Kaufman
>>
>> Original Poster: rwall-at-ix-dot-netcom-dot-com
>>
>> John,
>>
>> I suspect that your "near field" is just composed of the concentric magnetic
>> "fields" of the DC current flowing in the TC as opposed to the EM field. If
>> a wire with a few milliamps DC flowing through it is approached with a cheap
>> compass the concentric magnetic fields are readily appearant. Turn your TC
>> horizontally and approach the side of the coil with a compass on the end of
>> a long insulated pole. The compass should align itself with the longitudnal
>> axis of the coil confirming that it's the concentric magnetic fields of the
>> DC current in the TC. As an aside, the electric "fields" of the DC current
>> should radiate radially at right angles to the longitudnal axis of the TC.
>>
>> BTW, the compass should be an easy way to establish the overall polarity of
>> DC current in a TC.
>>
>> R. Wall
>
>
>
2/26/99
Bryan and list,
There is a definite DC polarity bias with disruptive TCs. I do not know about
DC coils. If memory serves me correctly, DC bias was not observed in a tube
coil. Presumably the wave form is symetrical and any form of bias is controled
by the tube. However, memory is a fragile thing and I refer you to Richard
Hull's body of work in this area.
RWW