Basic Question
Hi,
Have small question about basic electric theory concerning induction. For example I know that a wire moving through a magnetic field will induce an emf. However will an electric field also induce an emf if a wire moves through it? Would this effect be what makes fluorescent lamps glow underneath power distribution lines? Asimov ****** .... Just a little force field zap. |
Basic Question
"Asimov" wrote in
: Hi, Have small question about basic electric theory concerning induction. For example I know that a wire moving through a magnetic field will induce an emf. However will an electric field also induce an emf if a wire moves through it? Would this effect be what makes fluorescent lamps glow underneath power distribution lines? Asimov ****** ... Just a little force field zap. A fluorescent tube works by an electric field inside the tube causing a discharge, and this electric field can come either, as normally, from applying a mains voltage across the tube, or from the electric field produced by a power line. So fluorescent tubes will produce a visible glow under a power line, though usually it is only visible after dark as it is much weaker than the light they normally produce. The current through a fluorescent tube under a power line would probably be 20 – 200 microamps (µA) depending on the field. This is much less than a person can normally perceive, so you can hold the tube yourself under the power line without it hurting. (For comparison, a 10 W tube at 230 V draws 40 mA – 200 times greater). You can sometimes also make a fluorescent tube produce visible flickers by holding one end and rubbing your foot on a carpet to generate static electricity, though again, this needs to be done in a dark room. http://www.emfs.info/sci_EffectsOnEquip.asp Electromagnetic Induction info http://makeashorterlink.com/?A24A431E7 A Google search or a decent textbook should also help. |
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