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Retarded potentials...
Sue... wrote: BlagooBlanaa wrote: -=-
Magic! "Retarded potentials... just a convenient way of calculating forces but, in reality, the forces are transmitted directly between charges and currents by some form of magic). ... " farside.ph.utexas.edu/teaching/em1/lectures/node45.html Put a magnet on the kitchen table and it will shine itself away as the refrigerator door is opened and closed. Stick the magnet on the door (no relative motion) and it will last a long time. Keepers are typically installed to help the magnet or magnetic assembly resist demagnetization during handling, transportation, or storage. | "A keeper is a piece of high permeability material that is placed | between the poles of the permanent magnet, providing a path (a | path largely internal to the keeper) for the external flux that | would otherwise spread out into the presumably low-permeability | region between the poles. The keeper should have a shape and size | that elminates any gaps between the poles where the field could | "leak out." $$ "Otherwise in-vacu" error-bars suck. $$ Toilet-plunger (or refridgerator suction-cup) "keeper", analogy: $$ Think of this as you would placing a wet fibre floor-tile in $$ between two toilet-plungers as a "keeper" to keep the suction $$ from "leaking out". You go wit fridge suction-cups otherwise. $$ $$ Then: Fridge Magnet = Suction Cup, equation. $$ Think of a Regrigerator Magnet as a Fridge Suction Cup. $$ Each must do WORK in OVERcoming friction, or FALL down. $$ Fridge magnet = Refrigerator Suction Cups-of-Trembling. $$ $$ Suction-cups CANNOT "act-at-a-distance", like a Fridge magnet. $$ $$ Sincerely, ```Brian A M Stuckless, Ph.T (Tivity). To sum-up their explanation: Attraction occurs because the electric fields of similar particles are in phase which therefore affects the phase relationship between theirr magnetic fields (electro-magnetic fields hence photons). Fridge magnets CAN "act-at-a-distance" UNlike Suction-cups. Fridge Magnet = Refrigerator Suction Cups of Trembling. Retarded potentials... |
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