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We take positive charge as a test charge because positive charge is higher potential and negative charge is lower potential. Therefore, influence of positive charge on other charges is greater than negative charges. We can also take negative charge but the effect will be lower.


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To accelerate charges you use directly or indirectly EM fields. In accelerator tubes directly, for physical bodies indirect with surface electron-electron interaction. Part of this EM effect escape at the same moment and you get radiation. Same situation when the particles moved in circles or stopped. Writing this I realize that it could be explaint in ...


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Imagine the field lines of a point charge - they all point outwards of the charge in a radial direction. Now consider the following statement: the change of the field does not propagate instantaneously, but it has to propagate through local interaction. When we nudge into the charge, a ripple in the field propagates to tell the other field lines "hey guys, ...


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I think understanding cerenkov radiation qualitatively might help a bit. Cherenkov radiation results when a charged particle, most commonly an electron, travels through a dielectric (electrically polarizable) medium with a speed greater than that at which light would otherwise propagate in the same medium. Moreover, the velocity that must be ...


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OK to get this all right you should look in a good semiconductor device book, Maybe Ben Streetmans "Solid State Electronic Devices". (But I'll wing it.) To understand PN diodes we break the current up into two pieces. The drift current due to the built in electric field in the depletion region. and the diffusion current (about which you are asking.) The ...


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Fleming's right-hand rule applies when a conductor is moving in a magnetic field and the current is induced. However, in this case, we have a charged particle moving through a non-varying magnetic field, so it's Lorentz magnetic force law that applies best here. The simple form, in which there is only a magnetic field component (and no externally applied ...


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You Should consider lorentz force into account with the absence of electric field the lorentz force on electron is given by F = -e(v x B) Visit http://sun.iwu.edu/~gspaldin/B_deflection_Lab.pdf


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When you take a brass plate of considerable thickness and place it in between two charges, say positive and negative, induction takes place in the brass plate since it is a conductor: the electrons shift to the end near the positive charge while the cations stay near the negative charge. Now, induction occurs in order to make the field outside a certain ...


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The brass plate is a conductor, so the potential will be the same on both sides. The thickness of the brass plate therefore subtracts from the effective distance between the two charges, making the electric field strength higher in the remaining open space between the charges. This stronger field will cause more force to be experienced by each charge. ...


1

There are various layers one could address your question. As all observables in QM, the charge exist because there exist a self-adjoint operator associated to it. This operator corresponds to a (class of) experimental instruments that the observers use to make measurements on the system, the collection of possible numerical outcomes being known as charges. ...


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Ionization of this sort is not caused by positive or negative charges per say, but by an electric field. We can view the ionization as the electric field trying to accelerate the electrons and nucleus of an atom in opposite directions and ripping them apart. (In reality, this is a minor effect. Most ionization is caused by a chain reaction as free electrons ...


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Both positive and negative charges can produce ionised air molecules, but the mechanisms are different. A positive charge attracts electrons produced by background radiation. The high field strength accelerates these electrons and the electrons collide with and ionise air molecules. The electrons from the ionised air molecules are in turn accelerated ...



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