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ethane
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Physics Question:
All right, well I have read over the textbook-type material behind the questions I am about to ask. So, I really don’t want equations thrown at me. My problem is mostly with conceptual-level information:
A) Concerning Capacitance- If you had two capacitor plates that were not attached to a source of voltage, doubling the distance between them would theoretically double the value of capacitance (due to the definition of potential difference) at that immediate moment. That I am just fine with understanding. However, when attached to a source of voltage, the inverse relationship is present: greater distance means greater capacitance. This would imply that an electric field of constant magnitude would develop regardless of distance between the plates BECAUSE of the “manipulation” by the source of voltage in establishing that field. Charged plates by themselves, when being spread apart, obviously lose electric field strength as distance between them is increased. Can someone clear this up for me and set it in perspective?
A Second Part to Part A- In my physics textbook, the value of electric field between two plates is expressed as a constant multiplied by surface charge density. I understand Gauss’s law, but area simply does not change correspondingly as you increase the distance between the plates. So what is up with this?
B) A Fairly Simple Yet Odd Circuitry Question- With electromotive force aside, let’s look at the actual electrical forces, rather than the potential gained due to those forces. When I picture a simple squared off wire with a single source of voltage in the middle of a side of that wire, it would seem that certain points along that wire experience different forces in terms of direction of induced acceleration. Some flow of current seems to be against the electric force basically aimed towards the source of voltage at certain points along the wire. So how can charge flow remain so straightforwardly constant? When I think of a single electron in the wire, I imagine it getting stuck at certain points along the wire, not feeling favorable forces for the movement in which it must go in order to end up gaining energy in the end of things. Any clarity available?
Thanks for your help!
All right, well I have read over the textbook-type material behind the questions I am about to ask. So, I really don’t want equations thrown at me. My problem is mostly with conceptual-level information:
A) Concerning Capacitance- If you had two capacitor plates that were not attached to a source of voltage, doubling the distance between them would theoretically double the value of capacitance (due to the definition of potential difference) at that immediate moment. That I am just fine with understanding. However, when attached to a source of voltage, the inverse relationship is present: greater distance means greater capacitance. This would imply that an electric field of constant magnitude would develop regardless of distance between the plates BECAUSE of the “manipulation” by the source of voltage in establishing that field. Charged plates by themselves, when being spread apart, obviously lose electric field strength as distance between them is increased. Can someone clear this up for me and set it in perspective?
A Second Part to Part A- In my physics textbook, the value of electric field between two plates is expressed as a constant multiplied by surface charge density. I understand Gauss’s law, but area simply does not change correspondingly as you increase the distance between the plates. So what is up with this?
B) A Fairly Simple Yet Odd Circuitry Question- With electromotive force aside, let’s look at the actual electrical forces, rather than the potential gained due to those forces. When I picture a simple squared off wire with a single source of voltage in the middle of a side of that wire, it would seem that certain points along that wire experience different forces in terms of direction of induced acceleration. Some flow of current seems to be against the electric force basically aimed towards the source of voltage at certain points along the wire. So how can charge flow remain so straightforwardly constant? When I think of a single electron in the wire, I imagine it getting stuck at certain points along the wire, not feeling favorable forces for the movement in which it must go in order to end up gaining energy in the end of things. Any clarity available?
Thanks for your help!