All Questions
502
questions
0
votes
2
answers
67
views
Voltage: work to move a charge, or difference of electric potential?
Let's say I have a single positive charge inside of an electrostatic field. I want to move this charge from point A to point B and determine the voltage between the two points.
Points A and B are the ...
- 3
-2
votes
5
answers
216
views
Why is my idea of voltage drop wrong?
when battery is connected to 2 ends of a wire, potential difference is created, this causes electric field causing electrons to move, the field gives the electron electric potential and the thus ...
- 19
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
0
votes
6
answers
136
views
What is electromotive force? What's its relationship to Voltage? + clarification of confusion
So first of all, yeah I know that the electromotive force is not a force (the name was coined by Alessandro Volta I think).
About Power and dissipated power
The power with wich a battery provides the ...
- 11
4
votes
1
answer
165
views
Series Solution of Laplace Equation in Spherical Coordinates
I was recently Studying Griffiths Electrodynamics after a long time and there I saw the Laplace equation. Because it was my second time going over Griffiths so I thought maybe I should try to derive ...
- 585
3
votes
5
answers
1k
views
Can a positive charge have a negative potential?
I'm studying about electrostatic potential due to a point charge and was wondering - can a positively charged point have negative electrostatic potential?
V=Kq/r for a positive point charge.
Assume B ...
- 133
1
vote
1
answer
33
views
Does it make a difference whether potential difference is denoted as a negative or positive value in an answer, since it's just a scalar? [duplicate]
Does it make a difference whether potential difference is denoted as a negative or positive value in an answer, since it's just a scalar? Sorry if it's a dumb question, I was just a little unsure.
- 11
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
2
answers
50
views
Equipotential surfaces
Why two equipotential surfaces cannot intersect What is the logic and reason behind it?I know that two electric field lines cannot intersect but what about equipotential surfaces?
1
vote
0
answers
38
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Electrostatics: Electric Potential of Earth [duplicate]
I have a very basic question which is: Why we consider the potential of Earth to be zero?
Generally in physics we consider the electric potential at infinity to be zero. But while reading about ...
- 64
1
vote
1
answer
80
views
What does this formula of Electric potential generated by spherical symmetric charge density mean?
I found this formula (14.5) in the book Classical Electromagnetism in a Nutshell by Anupam Garg,
$$\phi(r) = \frac{1}{r} \int_0^r 4\pi r^2\rho(r)\;dr+\int_r^{\infty}4 \pi r\rho(r)\;dr.$$
I know it's ...
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
0
votes
4
answers
174
views
Why does the capacitance of a capacitor depend on charge and potential?
The formula of capacitance is
$$C = \frac{Q}{V}.$$
So the capacitance of a capacitor should depend on the charge and potential but it doesn't. Why?
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