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Question 1

0votes

1answer

131views

Working principle of Van de Graaff generator revisited

I have a few questions about principle how van de Graaff generator works. To avoid confusion I will use numbering from the wiki picture:[ADDED LATER #1] See also here for nearly identical ...

user267839

1,721

askedNov 24 at 14:35

Question 2

-2votes

0answers

10views

Typing math equations at physics stack exchange in mathjax [migrated]

How do you type equations at physics stack exchange. Seems like mathjax is proposed, but what are the steps ? ThanksSorry about the tag and if this not the correct place to ask for help.

D. Apple

11

askedNov 20 at 9:09

Question 3

2votes

0answers

41views

Does a net charge inside sealed container increase the pressure?

If you ionize the gas inside a sealed container, giving it a net positive or negative charge, does the pressure of the gas on the walls of the container increase due to electric forces?If so, has ...

David Gudeman

559

askedNov 15 at 15:42

Question 4

-1votes

0answers

62views

Why does my electroscope not work after the first time?

I have a gold leaf electroscope which works very well the first time. After thus it stopped working.Even when the gold leaf moves, it moves very less. How to fix this?

TheSilverBullet

127

askedNov 14 at 6:36

Question 5

0votes

0answers

27views

What is the equation for the change in electric potential due to a field generated by a point charge? [duplicate]

I'm a current AP Physics 2 high school student with a test in a few days; a swift reply would be very much appreciated. Thank you in advance.My question is concerning the formula for the change in ...

theFavorite

63

askedNov 11 at 0:59

Question 6

6votes

1answer

299views

Does the electric potential energy of a positively-charged particle vary directly with its distance from a charged particle or surface?

Current high school AP Physics II student here, so apologies if this question comes off as unlearned.I'm trying to learn about electric potential in my class, but I realize I still don't understand ...

theFavorite

63

askedNov 7 at 1:17

Question 7

1vote

2answers

99views

Why does the Poisson equation help to compute the electric field $E$ when the integral is intractable?

Currently I am reading through Griffiths Introduction to Electrodynamics and I am in chapter 3.1 about Laplace's equation.The author explains that our aim is to compute the electric field given a ...

metare stephanois

13

askedNov 5 at 10:30

Question 8

-1votes

2answers

59views

How does electric potential vary between two positive test charges? [closed]

If you plot a graph showing the variance of electric potential between two charges, does the middle have a maximum or minimum electric potential and why?

KN307

3

askedNov 3 at 9:18

Question 9

0votes

0answers

55views

Why am I getting Work done as negative in bringing a positive charge near another positive charge? [duplicate]

Let us consider a charge $Q>0$ at origin. Let $P(r,0)$ where $r>0$ be on $X$ axis.Consider a point $M(x,0),\:x>r$ from which we have to move a charge $q>0$ towards point $P$.Now I am the ...

Umesh shankar

113

askedOct 31 at 18:49

Question 10

0votes

3answers

83views

When do we consider that grounding the conductor makes the potential zero?

When do we consider that grounding the conductor makes the potential zero?I was recently seeing why is the outer charge of the system of grounded conducting plate becomes zero, and the reason given ...

Aditya

23

askedOct 30 at 15:06

Question 11

2votes

1answer

80views

Edge singularity and finite energy in a conducting wedge

Solving Laplace in a conducting wedge of opening angle $a$ with Dirichlet data on $\phi = 0, a$ gives$$\Phi(r, \phi) = \sum_{n=1}^\infty A_nr^{n\pi / a} \sin \frac{n\pi \phi}{a}.$$Near the apex $r ...

Gerold Wallner

71

askedOct 28 at 21:25

Question 12

0votes

0answers

45views

How is the $E$ field at the surface of a charged rod affected by its dielectric constant?

I am seeking clarification on a concept from a test question I have been studying.Essentially, the question gives an example of an infinitely long charged rod, made of an insulating material. The rod ...

L. Minus

23

askedOct 26 at 7:31

Question 13

1vote

2answers

141views

Will an off-center charge inside a conducting shell experience a force, or is the force zero? [duplicate]

I have a fundamental question about the force on a charge inside a conducting shell that I can't resolve.The setup:Take a hollow, spherical conducting shell (it can be charged or uncharged).Place ...

FIDEL KHAMAR K 9I

11

askedOct 19 at 4:06

Question 14

-1votes

2answers

80views

Why is the electrical field outside spherical (shell) conductor radial if the charge $q$ inside is not concentric with the shell?

Suppose we have a spherical shell that is a conductor and randomly inside the shell a charge $q$. Then inside the shell the electrical field should be $0$. Why is that?I'm thinking that the ...

per persson

131

askedOct 17 at 17:14

Question 15

3votes

1answer

77views

Use of Thomas-Fermi approximation for 2D fermionic gas with series of potential barriers

For a 2D electron gas of spinless fermions we can easily compute the density profile $n(x,y)$. If now I add a series of square barriers along only one direction, say $V(y)$, I can factories my density ...

Derrick Rossi

63

askedOct 16 at 11:49

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Stack Exchange Network

Questions tagged [electrostatics]

Working principle of Van de Graaff generator revisited

Typing math equations at physics stack exchange in mathjax [migrated]

Does a net charge inside sealed container increase the pressure?

Why does my electroscope not work after the first time?

What is the equation for the change in electric potential due to a field generated by a point charge? [duplicate]

Does the electric potential energy of a positively-charged particle vary directly with its distance from a charged particle or surface?

Why does the Poisson equation help to compute the electric field $E$ when the integral is intractable?

How does electric potential vary between two positive test charges? [closed]

Why am I getting Work done as negative in bringing a positive charge near another positive charge? [duplicate]

When do we consider that grounding the conductor makes the potential zero?

Edge singularity and finite energy in a conducting wedge

How is the $E$ field at the surface of a charged rod affected by its dielectric constant?

Will an off-center charge inside a conducting shell experience a force, or is the force zero? [duplicate]

Why is the electrical field outside spherical (shell) conductor radial if the charge $q$ inside is not concentric with the shell?

Use of Thomas-Fermi approximation for 2D fermionic gas with series of potential barriers

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