All Questions
Tagged with voltage electric-fields
243
questions
2
votes
1
answer
63
views
Does the geometric shape of the cross-section of an infinitesimally thin conducting charged thread (wire) affect its electric field?
Assume that a solid conducting torus (toroidal ring), with a cross-section of a circle of (minor) radius $r$, is negatively charged. Solving Poisson's equation, we can find the charge distribution of ...
- 2,503
1
vote
2
answers
64
views
Why is the electric potential from a positive sphere not negative? [duplicate]
Say we have a positive point charge located somewhere. Then the electric field due to this point charge is
$\vec{E} = \frac{1}{4\pi \epsilon_0}\frac{Q}{r^2}\hat{r} $ , now considering potential is $V =...
- 119
1
vote
2
answers
159
views
Does cutting out the surfaces with no surface charge affect the charge distribution on the remaining parts of a conducting surface of arbitrary shape?
Assume that we have an arbitrary conducting surface being charged positively/negatively. Also, assume that we have extracted charge distribution by solving the Poisson's equation with proper boundary ...
- 2,503
0
votes
2
answers
55
views
Confusion about reference point for potential difference
My confusion comes from trying to find the potential difference of a spherical conductor with an inner shell of radius $R_1$ and an outer radius $R_2$.
I tried using a reference point of $R_1$ and ...
- 3
1
vote
3
answers
105
views
Electric Potential in circuit confusion
I reviewed some of the fundamental physics and I looked back at the equation for Electric potential at a point p: $$V(p) = k \sum_{i} {\frac {q_i} {r_i}}$$ where
p is the point at which the potential ...
- 135
0
votes
1
answer
68
views
Equation of a equipotential surface
I have been trying to find a equation for the equipotential surface of a dipole , so I started with a simpler system of a singular charged particle , here are few things I know about the equipotential ...
- 5
2
votes
1
answer
45
views
I'm trying to figure out how to go from the electric potential of a uniformly charged semi-circle, to the electric field
The question asks
"A thin plastic semi ring of radius $R$ has a uniform linear positive charge density $\lambda$.
a) Determine the electric potential $V$ at point O, the center of the semi ring.
...
- 21
0
votes
1
answer
76
views
Circuit without grounding
I'm learning about the notation of grounding.
In this post of Wikipedia, https://en.wikipedia.org/wiki/Floating_ground, it is said that
Conductors are also described as having a floating voltage if ...
0
votes
4
answers
88
views
Why is the electric field strength ($V/d$) constant in a charging capacitor?
The electric field strength at a point in a charging capacitor $=V/d$, and is the force that a charge would experience at a point. This doesn't seem to make sense, as all the capacitor is is 2 plates,...
- 131
1
vote
2
answers
63
views
Why can define the electric potential (voltage) in alternating current?
(All SI unit used in this question)
The electric potential U is defined in electrostatic field that The electric field is the (negative) gradient of some scaler verctor, if and only if the electirc ...
- 13
0
votes
3
answers
57
views
A question regarding the concept of potential difference between two points in an electric field, as stated in my 12th grade book
My 12th grade physics book on electrostatics says:
Potential difference between two points in electric field can be defined as work done in displacing a unit positive charge from one point to another ...
1
vote
1
answer
87
views
Purpose of potential difference in the presence of an electric field
Based on my understanding, charges are pushed along wires due to an electric field created by the battery, and charges gain electric energy as they loop through the battery. But I can't seem to ...
- 15
-1
votes
1
answer
39
views
Would it be right to say that “Electric Potential” = the potential energy of an individual unit of charge at a certain point in a electric field?
Any replies from people who actually understand the topic (better than me, to say the least lol) and are able to clarify the topic (unlike my teacher), are highly appreciated and encouraged.
- 11
2
votes
4
answers
263
views
Electric Potential and Potential Energy
Electric Potential definition is as follows:
Electric potential (also called the electric field potential,
potential drop, the electrostatic potential) is defined as the amount
of work energy needed ...
- 65
0
votes
0
answers
43
views
Before and after current passes through a resistor is the potential considered to be constant in the conducting wire? What about V due to battery? [duplicate]
(This is not a duplicate. I am asking this because I am confused with the potential difference provided by battery and the effect of R(resistance) in in determining the potential difference). Recently ...
- 21