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![]() "w_tom" wrote in message ... Scout - you are correct. To create an electric current, the magnetic field must be changing. This is basic and fundamental to Maxwell's equations and should have been known to those posting permanent magnets creating electricity. Maxwell's equations are boundary conditions. They are not causal equations. The changing E does not create the changing H and vice versa. Here's two examples that demonstrate this: The E and H fields of cellular phone signals in a high multipath environment are uncorrelated. If the E caused the H they would be correlated. Maxwell's equations do not apply to these signals at the point they are measured. The E and H fields of a plane wave in free space are related through the intrinsic impedance of space and supposedly "Maxwells equations" (as you "understand" them). The plane wave impinges on an H field shielded room. Inside the room the H field virtually goes to zero, the E field is virtually unaffected. The E field exists without the H field. The magnetic field of a permanent magnet comes from moving charge - electrical current. There's no other way to produce a magnetic field. It's the curl of E according to Maxwell. How is the magnetic field of a permanent magnet produced? Electrons moving inside 'shells' of the atom are totally irrelevant to electricity. Electricity means electrons move from atom to atom. It means the conductive path is a complete circuit. A permanent magnet has no moving field; therefore creates no electricity. Motion is also necessary. The movement of charge alone is what is defined as electricity. It doesn't matter if its atom to atom. Bound charge on a moving macroscopic body is also considered electricitiy - current flow. The source of magnetism in a permanent magnet is the motion of charge. Furthermore note many half truths. Where are the numbers? Yes the sun can vaporize anything. Therefore we must keep everything out of the sun? The sun is an uncontrolled fission reaction spewing its waste products at earth. Sit in the sun for 9 hours on a nice summer day with no sun protection and your chances of getting cancer are much higher than living next to 3 Mile Island all your life! Too much salt kills. Therefore the salt shaker should be treated as a hazardous material. It is. Ever see the MSDS sheet for it? The warnings on children's play sand in California? This is how others promote hype and fear. No place do these fears apply to high voltage power towers. You would think from these posts that those high voltage towers subject the human body to 5 Telsa. Read the conclusions of the NASA paper. Low doses can change cellular growth. In one cited study, 200 mGauss caused changes to cellular growth. That proves fields from electric lines will harm humans. Wait. That field is less than the earth's magnetic field. Therefore we are all being killed by the earth? This is the type of hype and fear being promoted. The earth's field is essentially static. Powerlines fields are electromagnetic - they are changing 60 times a second. Big difference! Worry. Where the wire bends, then fields are so much stronger? How much stronger? Trivial stronger. Again numbers would expose the hype. And hype it is. Strong enough to induce arcing and radiation. Posted is proof that all electric fields kill? Why do trivial fields from power lines kill when significantly larger fields (a decade+ larger) from the CRT do not? CRT fields are at 15 KHz, not 60 Hz. What do you use the word kill when all the references cited talk of increases in cellular activity? In another citation, field exceed 1 gauss before considered dangerous. So where is this 1 gauss field from the high voltage distribution line? It must be if the line is 230 Kv? Again, posted was fear without considering what actual numbers would be from that power line. Magnetic field depends on current, not kV. So what is cited as dangerous? Because fields generated by a building transformer might be hazardous, then high voltage transmission lines also must be dangerous? They could be. The field of a transformer is contained within the core of the transformer, it's designed that way. The magnetic field of a transmission line is external to it. In fact, all the power of a transmission line is contained in the field suurrounding it, not in the conductor. The conductor is net neutral. Again, notice which electric lines are discussed. Not those high voltage transmission lines. Lower voltage, high current electric wires inside the building. Again there is this problem with hyping all electricity as dangerous only because very high magnetic fields MIGHT be dangerous. Interior wiring very bad! Power lines bad! Ball park numbers. Long before the location is dangerous, a CRT or TV would have display problems. Not so, they are shielded with mu metal. Now we have something concrete to consider. IOW we have a ballpark number AND some way to measure for that number. More interesting. What fields are really deadly? Magnetic or Electric? I wonder if those hyping fear even know the difference. But most shocking is some ridiculous idea that a motionless magnet creates electricity. Go back and read again what I wrote. A permanent magnet does have current flow. That IS what produces the magnetic field. Go check your Maxwell's equations to find the source of magnetism. It's the curl of E, electric field lines that close upon themselves. The path of an orbiting electron is a closed E path. Can you name another source of curl E that causes magnetism in a permanent magnet? That is also why del dot B is zero. There are no magnetic monopoles. Get the gauss meter. Take some measurements. Suddenly much of the hype being promoted here by some will disappear. Amazing what a few numbers can do to make so many previous posts irrelevant or misleading. Check the frequency response of the gauss meter. Then check your readings against the field strengths causing biological changes in the numerous scientific references I gave and decide for yourself. Statistical studies show correlation, not causality. In fact, you can have a study in which E fields changed the outcomes of the test group on an individual basis, yet the statistics show no change. Real science is the lab -cause and effect is the only definitive answer. Satan and Demons live under power lines! Amen!!! Praise!!!! Bob Crantz Scout wrote: I thought the flux had to cross a conductor for current to flow. "Bob Crantz" wrote in message link.net... A permanent magnet does have current flow. |
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