Questions tagged [electrostatics]

Electrostatics is concerned with the electrical fields and scalar potentials of stationary electrical charges and charge distributions. Use this for questions about electromagnetic situations in which currents and magnetic fields are absent, otherwise use the [electromagnetism] and/or [magnetic-fields] tags.

Filter by
Sorted by
Tagged with
0
votes
1answer
32 views

Do propagating electric fields have energy stored in them?

We know that speed of electric field is C in space, when we place a charge say at location P the electric fields from P travels outward and signal reaches other places later than charge was placed at ...
4
votes
2answers
62 views

How come the filled water bottle work as a stylus for phone but not the empty bottle?

Take an empty plastic bottle, and make it slide on a mobile screen. You would find that it's not doing anything. Now filled up this bottle with water and try doing the same. This time you will find ...
0
votes
1answer
12 views

Charge on a conducting sphere

As far as I know, to have a net flex through a closed surface there must be a charge inside it. However, what if I have for example a conducting sphere where the charge accumulate on the surface, will ...
0
votes
0answers
9 views

Do neutral conductors be attracted to a Van de Graff generator?

As far as I know, static electricity occurs when we have one object becoming positively charged, and another negatively charged, due to contact between them (usually rubbing). Those objects will than ...
0
votes
0answers
19 views

How to calculate a volume integral from a data file containing $x$, $y$ and $z$ coordinates and electric field value at each $(x,y,z)$? [migrated]

I have a data file from a simulation that contains $E$-field values at different coordinates $(x,y,z)$. I want to calculate the integral $\int E^{2} dV$ over a cylindrical volume in Python or MATLAB. ...
0
votes
2answers
39 views

What is meant by a potential of an object in context of electricity?

On my journey on learning about electricity and voltage in particular, I asked a few questions in this site. And I often come across terminology of relating potential to objects, like for example in ...
1
vote
1answer
30 views

Gauss's Law for planes

Why when we apply Gauss's Law on a conducting plane we choose the Gaussian surface to be a cylinder which one end of it is inside the conductor, whereas when we apply Gauss's Law on an insulating ...
0
votes
0answers
14 views

Discharge of static electricity

I watched this video about static electricity and I wanted to verify that I understand correctly. What we see in the picture is one lady touching with one hand this device that generates static ...
1
vote
1answer
32 views

What is the difference between electric current and electric discharge?

We know that when we have 2 oppositely charged objects (As in static electricity for example), when one of these materials will come in touch with a neutral conductor, there will be a discharge - ...
0
votes
0answers
13 views

Conductors vs insulators with static electricity

I hope I can make this clear enough: I am trying to understand: what are the rules/constraints regarding to the materials that can produce static electricity? I'll start with what I know about ...
0
votes
1answer
34 views

How does earthing happen?

Earthing, as I have been told, is done by inserting a conductor in the ground whilst it is connected to the body whose earthing needs to be done. But how does the charge get transferred into the ...
0
votes
1answer
42 views

I am confused on how to think about potential energy stored in capacitors [duplicate]

Energy stored in capacitors is represented by $$U = \frac{1}{2} QV$$ Now I have heard 2 reasons why there’s a half factor, unlike the general potential energy equation, which is $U = QV$. Capacitors ...
0
votes
1answer
49 views

Is voltage a difference between two charged objects or two positions in a field?

I'm awfully confused about the concept of voltage. I know that it is "difference in electric potential between two points", and that voltage is always between 2 points. There is no ...
1
vote
1answer
24 views

How to identify series and parallel connections of capacitors in complex circuits? [closed]

Like for this question (picture attached) how to identify if capacitors are in series or in parallel?
1
vote
2answers
41 views

Does energy of a capacitor means energy stored in both plates?

I've a doubt in this, Does the term potential energy of a parallel plate capacitor means the energy stored in both the plates or a single plate, since the formula $E=Q^2/2C$ , $Q$ is the charge of ...
1
vote
1answer
55 views

Tricky thought on Gauss's law

When the charge enclosed by a gaussian surface is equal to $q/2$ nought shouldnt the number of field lines be equal to half which does not make sense at all.
-1
votes
2answers
39 views

What is the equilibrium of two equal charges on a pendulum? [closed]

Suppose you have two equal point charges of magnitude $q$ and mass $m$ suspended by strings of length $L$ on opposite sides of a pendulum, both making an angle of theta with the $y$-axis. The question ...
1
vote
1answer
44 views

Is this a correct way to think about 2 batteries connected in series?

Ok in this thread I asked about the potential difference between two separate batteries. My thought was, that if a voltage of a battery is all about potential difference between the two terminals, ...
0
votes
2answers
33 views

Does the number of field lines crossing an area depend upon angle between them?

Consider Electric Field Lines crossing a square area (for simplicity) such that all field lines are parallel and make an angle say $\alpha$ with the area vector of the square. Let us vary the angle $\...
0
votes
1answer
23 views

Work done on a charge inside a homogeneous electric field and changes in Energy of the system

How to understand the concept of work using the following example: a positively charged particle (with charge $Q$) is placed in between a charged in a homogeneous electric field between the capacitor ...
1
vote
1answer
45 views

Does work done in a capacitor in moving a charge or increasing potential difference always twice the potential energy stored?

On doing calculations like this: Work done in moving a charge across a potential difference = $(CV)V$ = $CV^2$ Potential energy increased = $(1/2)CV^2$ From this work done is twice the potential ...
0
votes
1answer
36 views

Can a balloon and wool be seen as two terminals of a battery?

From what I understand, a battery produces potential difference across its two terminals. It does that by producing an accumulation of charges (positive charge in the positive terminal, negative in ...
1
vote
1answer
31 views

Contribution of inner induced charges to the electric field outisde

We have an arbitrary hollow shaped conductor, with small thickness. Suppose we place a charge $q$ at any arbitrary location within the hollow shaped conductor. By Gauss's law there will be a total ...
0
votes
4answers
89 views

Is the concept of voltage poorly explained or is it just me?

Ok my cognitive barrier is this: All the videos I watched about "what is voltage" explains it pretty much this way: So there is an electric field which causes electrically charged objects ...
-2
votes
0answers
20 views

Electric dipole [closed]

The electric dipole consists of charges + 𝑄 and βˆ’π‘„ located at a distance of 𝑙 from each other. The charge q lies on the dipole axis at a distance r from its center (π‘Ÿ βˆ’ 𝑙 / 2 from the first and π‘Ÿ...
0
votes
0answers
13 views

Find 𝒗𝟏, 𝒗𝟐, and 𝒗𝟑 in the circuit in Fig. 3.14 using nodal analysis [closed]

Find π’—πŸ, π’—πŸ, and π’—πŸ‘ in the circuit in Fig. 3.14 using nodal analysis
1
vote
0answers
29 views

Why the electric field inside a solid sphere is non-zero according to gauss while we know that the electric field inside a conductor is zero?

We know that the electric field inside a conductor is zero, but in my book, according to Gauss' law, the electric field inside a solid sphere (it's not mentioned if it's a conductor or non-conductor) ...
0
votes
2answers
24 views

Electric field due to a large, non-conducting plate and factors of 2

I'm trying to derive the electric field due to a single large, thin, non-conducting plate at a point (see figure). I'm solving it using 2 methods, and arriving at a different answer using both. I've ...
-1
votes
1answer
36 views

Method of Images in Electrostatics [closed]

What's the use of the method of images in electrostatics? I have absolutely no idea about its applications and the problems in which I should apply it. I would request someone to not only explain its ...
0
votes
2answers
46 views

Is battery a capacitor that's being continuously charged?

Is it correct to say that a battery is like a capacitor which keeps being charged?
2
votes
5answers
235 views

If I touch the “+” side of a high voltage battery, will I get shocked?

Voltage is electrical potential difference between two points. When these two points are connected using a conducting material, current flows. So far so good? Let's think of a high voltage battery (I ...
0
votes
2answers
35 views

Can we say that space without electric field is of 0 potential?

Can we say that a given point in space, without any charges nearby, has no electric field, and thus the electric potential in this point is 0?
0
votes
2answers
77 views

Finding the surface from the electric potential [closed]

I am stuck on a request from this problem: I have the electrostatic potential $$V(x, y, z) = -\alpha \ln\dfrac{x^2+z^2}{R^2}$$ for $x^2+z^2 > R^2$ (otherwise it's zero), where $\alpha, R$ are ...
0
votes
3answers
90 views

What is the connection between electric field and a battery?

Ok I'll start my question with laying some background: (Correct me if I'm getting things wrong - but don't be picky). Put electro-magnetism aside for this discussion - an electric field is some space ...
0
votes
0answers
39 views

Finding the surface charge density in the following system of conductors and charges [closed]

Two infinite conducting plates 1 and 2 are separated by a distance $l$. A point charge $q$ is located between the plates at a distance $x$ from plate 1. Find the charges induced on each plate. I am ...
1
vote
0answers
35 views

RG flow of quadrupole coupling in 6+1 dimension electrostatic problem

Given a classical action which describes electrostatics in 6+1 dimensions $$\frac{S_\text{eff}}{T}=\frac{1}{2} \int d^6x(\nabla\phi)^2+\frac{S_{p.p}}{T}$$ where the one particle action, that ...
0
votes
1answer
41 views

Why is $\vec{D}$ called displacement field and not $\vec{E}$?

I'm repeating my electrodynamics knowledge and immediately had a very easy question which drives me crazy (and not a dupe, at least I didn't find a suitable answer, although many similar questions): ...
1
vote
3answers
58 views

Electricity basics

I've seen this video explaining Electrical Potential, and there's something I don't quite get. Ok so if I got this right - electric potential energy is the potential energy stored by a charge when ...
0
votes
3answers
38 views

Does having an electric potential difference necessarily mean having current?

I'm fairly newbie to these concepts, so please try to give a simply answer. Electric energy is often compared to gravitational energy. This analogy helps to understand the concept of voltage. With ...
0
votes
1answer
35 views

Electric field lines inside a spherically charged shell containing charge

Given a spherical shell composed of protons (a hypothetical construct), how would one draw the electric field lines inside the shell if a proton is placed at the center of the shell ? The question is ...
0
votes
2answers
53 views

Addition of Potentials

Say we have a charged shell A (radius $R$) that is present within another charged shell B (radius $2R$). The charged shell A has a net charge $Q$ and the shell B has a net charge $3Q$. Taking shell A ...
2
votes
1answer
50 views

How to calculate charge density [closed]

I am trying to solve this exercise: Using this formula calculate electric intensity $$ \vec{E} = \frac{\vec{c}\times \vec{r}}{r^4} $$ $\vec{c}$ is constant vector, $r$ is magnitude of the position ...
0
votes
1answer
43 views

Electric field component in a capacitor with dielectrics inserted partially

In the above set up I have two oppositely charged capacitor plates seperated by a distance 'd' with half of the region between filled with a dielectric material of constant $K$ and the other half in ...
0
votes
1answer
82 views

Why do two approaches to this capacitors problem give two answers? [duplicate]

I came across a capacitors problem that seemed to be very simple, but I can't figure reasoning as to why two approaches to the problem yield two different answers. One of them is wrong, but I can't ...
0
votes
2answers
54 views

Why electric field due to a positive charge points radially outward? [duplicate]

We have always been taught and my book also says that electric field due to a positive charge points radially outwards.On the other hand for a negative charge the electric field points radially ...
0
votes
0answers
24 views

What will be the direction of motion of a test charge released at a point in an electrostatic field? [duplicate]

I have recently come across a statement in my book that, "when a test charge is released at a point in an electrostatic field, the direction of traversal of the test charge will not be along the ...
-1
votes
0answers
27 views

Electric potential at the center of the hypotenuse of a uniformly charged right triangle [closed]

I tried Playing around trying to find the electric field at the vertices of a right triangle until I saw the center of the hypotenuse. My first thought of finding the electric potential at the center ...
0
votes
1answer
24 views

In a capacitor there are four dielectrics filled [closed]

In a capacitor there are four dielectrics filled as shown in the figure, and we are required to find the equivalent dielectric constant. So I approached it by taking $K_1$ and $K_2$ in series and $K_3$...
1
vote
2answers
49 views

Does charge develop on the surface of a current carrying wire?

Well i think electric field must exist outside a current carrying conducting wire. Because if you consider a simple circuit with a resistor and a battery potential difference is created across the ...

1
2 3 4 5
…
122