I'm trying to learn electromagnetic phenomena on my own and some textbooks / articles which I read at first claims that there are surface charges on wires in circuits (DC particularly).
Distribution of these charges takes a form of rings (which seems to be important).
Image from Matter & Interactions by Ruth W. Chabay and Bruce A. Sherwood.
More or less same information was in various articles and books about electromagnetism, transmission lines etc.
So if my understanding is correct these surface charges are responsible not only for voltage between wires (i.e. electric field) but also creates the necessary conditions for current flow inside conductor (at least in simple DC cases), wich give us magnetic field.
And fundamentally all these mechanisms provide energy transfer from source to load by means of these electric & magnetic fields.
I thought i grasp general concepts but then it revealed that some conductors in real world seems to be grounded (e.g. outer conductor in coaxial cables, Neutral wire in three phase power system etc.)
Attempts to find any information about what is going during this process on microscopic level was unsuccessful. So my questions are:
- Is grounding affect all these surface charges ?
I'm interested mostly in simple DC circuit cases (like in textbook mentioned above).
Let say we have circuit consisting of battery and light bulb and we ground it (by grounding i mean to literally connect one of conductors of this circuit to Earth).
Isn't all the charges will flow to Earth from surface of grounded conductor (or redistribution at least break these ring patterns of charges) ?
But in this case circuit must stop to operate properly i.e. no surface charges hence no fields, no energy transfer etc.
I'm totally confused at this point. I thought these mechanisms same for almost all situations (from this simple 1.5V DC to power cord and HV lines) and hence the charges absolutely necessary at any case.
Therefore, the second question.
- Is my overall understanding wrong ?
I know my knowledge is superficial but i'm trying to create some mental model for myself. Please help.
P.S. I afraid i'm not ready for things like inducted non-conservative E field, EM radiation etc yet so please try to avoid it.