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Natural Science Forum / Physics / Particle Physics / January 2007Electrostatic field
Hi, As you know there is an electrical field around each electrostatic charge. I know how to create an electrostatic field. But I have problem by creating a "variable electrostatic field". Can you give me a guide? Thanks in Advance Dear Muhammed What do you mean by variable electrostatic field? if you mean that it's varyong in time, then it's no longer electrostatic. If you mean that it's varying in space only, what is your problem in that? > Hi, > As you know there is an electrical field around each electrostatic > charge. I know how to create an electrostatic field. But I have problem > by creating a "variable electrostatic field". Can you give me a guide? > > Thanks in Advance Dear Muhammed What do you mean by variable electrostatic field? if you mean that it's varying in time, then it's no longer electrostatic. If you mean that it's varying in space only, what is your problem in that? > Hi, > As you know there is an electrical field around each electrostatic > charge. I know how to create an electrostatic field. But I have problem > by creating a "variable electrostatic field". Can you give me a guide? > > Thanks in Advance > Hi, > As you know there is an electrical field around each electrostatic > charge. I know how to create an electrostatic field. But I have problem > by creating a "variable electrostatic field". Can you give me a guide? > > Thanks in Advance Sure. What you need is a variable amount of electrostatic charge. You can do this with an arbitrary capacitor, where you apply a variable potential difference across the capacitor according to the simple relationship Q = C * V. A variable potential difference can be generated either by a constant power supply and a voltage divider (rheostat) or a variable power supply. PD Dear PD, Thanks for your answer. But as you know, in a capacitor the electric field exist between the electrodes(blades), or we can say it is ristricted there. what I need is an variable electric field like what we see in a "Van de graaff" (that is limited just from one side). Do you have any idea? > > Hi, > > As you know there is an electrical field around each electrostatic [quoted text clipped - 9 lines] > > PD On Jan 3, 3:02 am, mohammad.esmae...@gmail.com wrote: > Dear PD, > Thanks for your answer. But as you know, in a capacitor the electric > field exist between the electrodes(blades), or we can say it is > ristricted there. what I need is an variable electric field like what > we see in a "Van de graaff" (that is limited just from one side). Do > you have any idea? A Van de Graaff generator is also a capacitor. A parallel plate capacitor is only one kind of capacitor among many. A single conductor also has capacitance, and calculating the capacitance of a single conductor is a common exercise in a first course in electricity and magnetism. So to answer your question, connect a variable power supply to the electrode of a Van de Graaff, and you have a varying electric field. PD |
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