All Questions
20
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
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
1
answer
38
views
Change in electric potential energy [closed]
I am trying to find the velocity of a charged particle $+q$ as it moves away from a charged shell of charge $+Q$ to a distance of $2R$. I know I need to find the change in electric potential energy ...
- 131
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
1
vote
2
answers
60
views
Why are there 6 interactions with 4 positive charges?
From a homework assignment, there are 4 spheres spaced 1cm apart. Each of the spheres are charged to +10nC and weigh 1 gram. The question wants us to find the final speed of the charges once they've ...
- 155
1
vote
1
answer
970
views
Change in potential energy of a parallel plate capacitor as a dielectric slab is moved in the space between plates
I was doing this question:
If a parallel plate capacitor made of square plates of side L and separation D is connected to voltage source V.
And then a dielectric slab of width D is introduced ...
- 243
0
votes
0
answers
130
views
Charging two spheres by induction n times
There is a conducting sphere $S_1$ of radius 'r' mounted on an insulating handle. The sphere is given a charge Q. Another uncharged conducting sphere $S_2$ of radius R mounted on an insulating handle ...
0
votes
1
answer
174
views
Motion of an electron near a proton [closed]
Statement of the problem:
Consider an electron and a proton that are initially at rest separated $a$ meters. Do not take into account the movement of the proton, because its mass is much greater ...
- 163
0
votes
1
answer
376
views
Change in electric potential energy after sphere splits in two
The problem:
Consider a uniformly charged sphere of radius $R$ and charge $Q$ and then they separate into two spherical halves of equal volume and charge, and both get to stabilize. Determine the ...
- 163
2
votes
1
answer
720
views
What is the electric potential energy of a system of 2 charges? [closed]
If we have two charges of +1C a distance of 1m apart, then if we fix one and bring the other from infinity, the work done = +k. Now, if we fix the other one and bring this one from infinity, the work ...
- 254
0
votes
0
answers
175
views
Calculating Electrostatic Energy from Capacitance Matrix
Let's say I have two spherical conductors and I put some charge on each. As I understand it, the electrostatic energy $W$ in the fields will be equal to
$$W = \frac{1}{2}C_{11}V_1^2 + \frac{1}{2}C_{22}...
- 962
0
votes
2
answers
998
views
Electric Potential from separating charges [closed]
Say there are 2 charges, one of charge C, and the other with a charge of -2C. C=1.5*10^-6 C. Initially, they are right next to each other. I pull them apart to a distance of 15 cm.
So I can use the ...
-1
votes
2
answers
696
views
Total potential energy for two charged particles
I'm trying to formulate a Lagrangian equation for a system of two charged particles. They have respective masses $m_1$ and $m_2$, and respective position vectors $\vec{x_1}(t)$ and $\vec{x_2}(t)$.
...
- 9
2
votes
3
answers
321
views
Potential energy & entropy of three particles
Let me first say that I am not a physicist, but I am trying to make a simulation on my computer and I have the following question.
Let's consider that we have three free charges that somehow can ...
- 141
2
votes
1
answer
4k
views
Infinite chain of alternating charge
The problem
There is an infinite chain (1d) of alternating charges that are in a distance a from each other. That is there is one charge +q and next to it -q and so on. Now calculate how much work it ...
- 325