All Questions
14
questions
0
votes
1
answer
213
views
Electric Potential, Work, Potential Energy, and Electric Field [closed]
I don't quite understand these concepts. What is the relationship of electric potential with work, potential energy, and electric field?
1
vote
1
answer
629
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
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
3
votes
2
answers
274
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
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
1
answer
353
views
Change in potential / potential energy of a charge in electric field [closed]
A uniform electric field of 2000 $(\frac V m)$ exists through all space (the field is in $+x$ direction). An electron is moved from the origin to the location where $x = -2.00 (m)$ and $y = +3.00 (m)$....
1
vote
1
answer
309
views
Electric energy from dipole moment
Conventionally one define electric energy as
$$
U = \frac{1}{2} \int \vec{E}(r') \cdot \vec{E}(r') d^3 x'
$$
where $\vec{E}$ is a Electric field.
And from textbook like Griffith, we know that ...
- 3,622
2
votes
2
answers
2k
views
Work done by the electric field on the charge - Negative or Positive?
Below is a question from my physics textbook:
$X$ and $Y$ are two points in an electric field. The potentials at $X$ and $Y$ are $V_x$ and $V_y$ respectively where $V_x > V_y$. A small, positive ...
- 175
0
votes
1
answer
92
views
What is the distance in between two shells of a spherical capacitor?
I am studying Capacitance for my Physics class. We have been working with parallel-plate capacitors, which I understand perfectly. However, I’ve seen some exercises with spherical and cylindrical ...
- 309
-1
votes
1
answer
1k
views
Conservation of energy in a uniform electric field
Say you place a positively charged particle between two plates with an uniform electric field between them. The particle will accelerate towards the negatively charged plate with a constant ...
- 1,307
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
2
answers
2k
views
Charged box and spring in uniform electric field--when does the box stop moving?
I'm having a lot of trouble trying to figure this out: a box of mass m and positive charge Q is attached to a spring of spring constant k, which is in the equilibrium position. They sit horizontally ...
- 51
1
vote
1
answer
13k
views
Problem in Proving the potential due to concentric shells between the shells
Imagine a spherical shell having charge Q. The Electric Field exists outside. I bring a test charge from infinity to the surface of the shell (I bring it radially to simplify the calculation and ...
- 2,797
0
votes
2
answers
1k
views
Potential Energy of a point charge in uniform electric field
I have to determine the potential electric energy from a point charge $q$ who is in an position $r$ inside an uniform electric field $\vec{E}$.
I tried to do it by using work definite integral and ...
- 501