All Questions
57
questions
2
votes
0
answers
50
views
Energy of a spherical shell
System: spherical shell with surface density.
Objective: calculate potential energy.
I found energy through potential.
Next, I found the formula for energy through the field, which gives two ...
- 21
0
votes
3
answers
196
views
I know that electric potential energy is defined for a system of charges, not for a single charge. But what about electric potential?
My professor explained me in the best manner possible about the electric potential energy and why it is NOT defined for a single charge, BUT my question is as Electric potential is just electric ...
- 23
0
votes
1
answer
49
views
How do I visualize total potential energy of charges?
In the following exercise from University Physics with Modern Physics (Young, Hugh D.; Freedman, Roger A..)
Two point charges are at fixed positions on the $x$-axis, $q_1 = -e$ at $x = 0$ and $q_2 = ...
- 1
1
vote
1
answer
62
views
Two charged spheres connected by a wire and one is inside the other [closed]
Two charged spheres are connected by a wire, a small sphere is located inside a bigger one. Both spheres are charged and connected through a wire. The charge of the small sphere is 20µc and the charge ...
- 11
4
votes
1
answer
772
views
Energy electrostatic of a charged sphere
I am reading the Feynman books.
In 8.1, we have shown that the energy of a charged sphere of radius $a$ is
$$U = \frac{4\pi\rho^2a^5}{15\epsilon_0}.$$
I tried to get this result using the following ...
- 145
1
vote
1
answer
639
views
Textbook question on calculation of potential difference between two points
My textbook has the following question
What is the potential difference between two points that are 50cm and 80cm respectively from a point charge of 2uC?
Unfortunately, the textbook has not taught ...
- 135
1
vote
1
answer
619
views
Redistribution of charge spherical capacitor
In a spherical capacitor, we have two concentric spherical shells, the inner one carrying a charge $Q$ and the outer one carrying charge $-Q$. If the inner shell is displaced from the center without ...
- 55
0
votes
2
answers
156
views
Energy stored in a Capacitor with dielectric [closed]
We have a parallel plate capicitor with capacitance C ($ C= \epsilon°A/d $) when no dielectric is inside it.
The charge on it is Q(+Q on left and -Q on right).
Now a dielectric slab of dielecteic ...
0
votes
1
answer
227
views
Electrostatic Potential, Potential Energy, Method of Images [closed]
I am a beginner in problem solving in the field of electrostatics. Well equipped with basic strategies and use of gauss' law. I wanted to analyze the situation below and couldn't wrap my head around (...
- 13
0
votes
1
answer
129
views
Why have we assume that the there should be no acceleration in deriving the Electrostatic potential energy
In the NCERT textbook grade 12, it is mentioned before deriving the work done in moving a charge $q$ from point $R$ to $P$ in presence of an electric field at Origin, $O$ by charge $Q$
Two remarks ...
- 753
0
votes
1
answer
239
views
Potential energy of two point charges of opposite sign (exercise)
I'm trying to do this exercise, but I don't understand how the textbook does it:
I don't understand, how they get a positive $27V$ and a got a few more doubts:
First thing, you can only measure ...
- 299
3
votes
2
answers
277
views
Help interpreting equipotential line diagram
I immediately understood that this question is about how work done to get a test charge from one equipotential line to another doesn’t depend on the path taken but this diagram seems a little strange ...
- 113
1
vote
1
answer
570
views
How to compute the self-energy of a sphere? Electrostatics [duplicate]
Not just the formula, how to derive it as well, im lost in this topic any help would be great.
- 73
0
votes
0
answers
48
views
Potential energy of a system of three charges question
Two point charges are located on the $x$-axis, $q_{1}=-e$ at $x = 0$ and
$q_{2} = +e$ at $x = a$.
(a) Find the work that must be done by an
external force to bring a third point charge $q_{3} = +e$ ...
0
votes
0
answers
320
views
Potential energy distribution near a cube with negative charges at 8 corners and one positive charge at its center
What is the potential energy of an arrangement of eight negative charges on the corners of a cube of side $b$, with a positive charge in the center of the cube? Suppose each negative charge
is an ...
- 159