[SI-LIST] Re: Question: Energy X'mit Directions of Maxwell's eq.s
- From: "Ched-Chang Chai" <ched_chang@xxxxxxxxxxx>
- To: ikanno@xxxxxxxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Thu, 26 Dec 2002 13:44:10 +0800
Hi Kanno-san,
I try to answer your question.
In the case of DC conductive current, the charges move at a steady rate,
thus J are constant in time.
This is magnetostatics, and all d/dt=0.
Thus, rot H = J.
The electric and magnetic fields are no longer interconnected in the static
case.
Direction of ExH is only applicable to time-varying fields.
The voltage source applied at the ends of the wire gives rise to a electric
field.
The charges in the wire move as a result of the applied electric field or
the potential difference.
Others please correct me if I am wrong.
Thank you.
--
Regards,
Chai
>From: ikanno@xxxxxxxxxxxxxxxx
>Reply-To: ikanno@xxxxxxxxxxxxxxxx
>To: si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Question: Energy X'mit Directions of Maxwell's eq.s
>Date: Tue, 24 Dec 2002 17:41:29 +0900
>
>
>Dear everyone,
>It's X'mas, so please forgive me to ask a very basic
>question about X'mission direction of holly Maxwell's equations.
>
>I want to ask the transmission direction of energy,
>of two rotational equations, which no text book says.
>I think the directions are implicit, but exists, hiddenly
>described by "rot"operator, such as;
>
>rot H --> J + dD/dt
> rot E--> - dB/dt
>
> I will be pleasured if everyone send me the advises,
> OK , reverse, nonsense, or it is profanity etc...
>Does anyone know the discussion on direction of MAXWELL's eq.s?
>
>I prefer above directions , because especially in the case of
>DC conductive current, "rot H makes J (sigma*E) ",
>seems to me , will explain the Amper's DC law visually.
>
>Internally in the conductor, ExH shows a strange direction;
>towards the radial center of wires. Why DC current can proceed
>in/on wires?
>The H in the air side, seems to me, provides the energy
> to the DC conductive current(?).
>
>And please remember Maxwell's relaxzation time ,
>a very very small response delay time of electrons to
>follow E after stopping random-walking. J has a delay.
>
> I should have a barbarity to imagine Amper's law as if it describes
>"result status" , though Viot-Savart law says J makes H... (source).
>
>Anyway, small joke in X'mas. ( Arrow or = , that's a question. )
>
>Have a nice X'mas !
>Regards,
>
>Izuru Kanno
>Sun Corp. Japan
>
> ^ ^ ^ ^ ^ ^
>o|@|o|Q|o|@|o|Q|o|@|o... zzz
> v v v v
>
>
>
>
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