Does a magnetic field rotate with a magnet...the answer!
in [Physics]
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From: Benj on 25 Feb 2010 22:24 On Feb 24, 1:39 pm, "Bill Miller" <billmillerkt...(a)worldnet.att.net> wrote: > Yep. Changing currents and accelerating charges cause the E and H. But this > is done in the "transmitter." > > From that point on, including the transmission lines, any matching networks, > the antenna and free space, everything is passive. > > All the best, > > Bill Well, "passive" yes, but I'm a bit skeptical about fields being "guided" out to space from the transmitter. We know that E and H fields do not cause each other. We also know that the causal source of both E and H fields are charges and currents. We also know that E fields cause currents to flow in conductors. So if we have an electric field directed into a transmission line we know that since the parts of the line (or guide) are conductive that electric field causes currents to flow. A flowing current causes a magnetic field. A changing flowing current also causes additional E fields that in turn cause more flowing currents. I suggest that it is these flowing CURRENTS that are the mechanism for energy to be propagated down the line. Of course there is a different situation where fields are propagated without currents. Like waves in free space. And such flows can be redirected and concentrated etc. A dielectric lens clearly does does that with no currents involved. Thus I'd argue that for E and H to be transmitted from the active devices without currents the entire line and antenna would have to be of an optical dielectric type. In that case alone would I say that the E and H fields leave the tube and are guided unchanged out into space. The very existence of near field effects shows that there are OTHER fields being generated that are NOT the original E and H.
From: Benj on 25 Feb 2010 22:26 On Feb 25, 10:13 pm, Benj <bjac...(a)iwaynet.net> wrote: > On Feb 25, 7:21 pm, Salmon Egg <Salmon...(a)sbcglobal.net> wrote: > > > Sorry, I do not want to end up thinking of you like I think of Benj. I > > will give you another opportunity to explain. > > "Burt"? I sure hope you don't think of him as you do of me. I've never > won two Nobel prizes in two years, you know. Oops. Sorry. Wrong "bert"!
From: Androcles on 25 Feb 2010 23:28 "Benj" <bjacoby(a)iwaynet.net> wrote in message news:3b0dfe4e-1b94-4e1d-821b-5e54b464f360(a)j27g2000yqn.googlegroups.com... On Feb 25, 5:03 am, "Cwatters" <colin.wattersNOS...(a)TurnersOakNOSPAM.plus.com> wrote: > "Benj" <bjac...(a)iwaynet.net> wrote in message > >>Any more questions? > > but it also depends on the volume not the surface area. So? Where is the "current" flowing in a magnet? =========================================== It's called a flux. It picks up iron filings.
From: BURT on 26 Feb 2010 00:25 On Feb 25, 4:21 pm, Salmon Egg <Salmon...(a)sbcglobal.net> wrote: > In article > <9dc5908d-ac98-4ee3-adfb-75f867dae...(a)e1g2000yqh.googlegroups.com>, > > > > > > bert <herbertglazie...(a)msn.com> wrote: > > On Feb 23, 8:44 pm, Salmon Egg <Salmon...(a)sbcglobal.net> wrote: > > > In article > > > <050688a2-85ed-44db-b8a3-98a0e46e5...(a)h17g2000vbd.googlegroups.com>, > > > > bert <herbertglazie...(a)msn.com> wrote: > > > > Field flows from south pole to north pole,and is in constant motion.. > > > > This is shown to us by its "lines of force" (compass) Turn > > > > mechanically an iron rotor into this field and pickup electrons and > > > > you have a generator. Have electrons enter this field and the iron > > > > rotor will turn,and you hhave an electric motor.Thus you see how both > > > > are the same. Two sides to the same coin. Both just hum,as they > > > > receive or transfer energy in the nicest way. Just one moving > > > > part. TreBert > > > > Field flows? How can such flow be demonstrated? Can fllowkng field be > > > accumulated in a reservoir? > > > > Bill > > > > -- > > > An old man would be better off never having been born. > > > Bill No electric field can not be stored. It has to be keeped flowing. > > Charge can be built up(like lighning) Electricity will not flow > > unless it has a conducter.(copper wire) Magnetizim and electricity > > two sides to same coin. Antenna and transmeter Two sides to the same > > coin. Best to store magnets north and south. TreBert > > Sorry, I do not want to end up thinking of you like I think of Benj. I > will give you another opportunity to explain. > > What do you MEAN by a field "flowing"? How can you tell whether a field > is flowing or is stationary? Give me an experimental (even a gedamken > version) that will make the distinction. > > If I go to a hydraulic analog, I can have a fluid flowing with a > pressure present. In a steady state state situation there will be a flow > field as a function of position--not a field that is flowing. The flow > field is the velocity factor of the substance that is flowing, That > field remains constant. Think of a hose carrying water from a hose bib. > There is a flow field in the hose that does not change even while you > can use the hose to fill a bucket. > > Please explain. > > Bill > > -- > An old man would be better off never having been born.- Hide quoted text - > > - Show quoted text - The gravitational field flows with its flowing mass through space- time. Mitch Raemsch
From: Salmon Egg on 26 Feb 2010 01:30
In article <4692e75f-87d6-432b-ab10-10272d6bcae4(a)l24g2000prh.googlegroups.com>, BURT <macromitch(a)yahoo.com> wrote: > > The gravitational field flows with its flowing mass through space- > time. OK. I am giving up on taking you seriously. Bill -- An old man would be better off never having been born. |