# Questions tagged [charge]

A fundamental property of matter which causes it to experience electromagnetic forces.

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### Electric field experienced by a charge

We have two charges, say $Q_1$ and $Q_2$. The magnitude of the electric field $E$ experienced by charge $Q_2$ is: $$E = \frac{k Q_1}{r^2}$$ where $k$ is Coulomb's constant and $r$ is the distance ...
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### Electric field at a point due to dielectric inserted in between a parallel plate capacitor [closed]

Here, I have a parallel plate capacitor with each plate having surface charge density $\sigma$. A dielectric of dielectric constant $K$, is inserted partially between the two plates. What would be the ...
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### What is the associated charge for the weak neutral current?

So for the strong force, there's color charge; for electromagnetism, there's electric charge; and for weak charged current, there's weak isospin. How about the weak neutral current? Is there an ...
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### What is the charge distribution on a parallel plate capacitor when one plate is grounded? [closed]

Let's say a large parallel plate capacitor is connected to a DC power supply. Then, the charge on the two plates will be +CV and -CV. If I ground the negative terminal (both the capacitor's and the ...
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### Flux change through a loop

I'm having difficulties understanding this thing. It would be lovable if someone could show me its derivations and prove it: In a conducting loop, there is a relationship between the total displaced ...
1 vote
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### Electrostatic potential outside of a charged ball [closed]

To preface, I have never solved Maxwell's equation or his resulting Poisson's equation in any coordinate scheme, nor am I a physics major. I'm entirely teaching myself how to do this, so I don't know ...
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### Is there any specific terminology for this type of current in spintronics?

In spintronics, there are several types of currents: Spin-polarized current: The two spins flow in the same direction with unequal contributions. Perfectly spin-polarized current: Only one species of ...
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### Does the geometric shape of the cross-section of an infinitesimally thin conducting charged thread (wire) affect its electric field?

Assume that a solid conducting torus (toroidal ring), with a cross-section of a circle of (minor) radius $r$, is negatively charged. Solving Poisson's equation, we can find the charge distribution of ...
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### How does this proof of Gauss’ law generalize from $1$ to $n$ charges?

I am having trouble seeing how the proof of Gauss’ law for one charge generalizes to hold for multiple charges in Griffiths’ introduction to electrodynamics. Gauss’ law is proved for one charge (for ...
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### Voltage: work to move a charge, or difference of electric potential?

Let's say I have a single positive charge inside of an electrostatic field. I want to move this charge from point A to point B and determine the voltage between the two points. Points A and B are the ...
1 vote
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### Charge besides conductor

This is a curiosity What would be net charge induced on a (say spherical) conductor when a positive charge is placed besides it. What I think is that a negative charge will be induced on surface near ...
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### What is charge on a fundamental level and what is it caused by?

On bigger bodies, I've learnt so far that charge is caused by a lack or excess of electrons or protons but when you look at an electron or proton, how are they charged? what is the cause of their ...
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### Understand power rating in layman terms

I have recently started the chapter of electricity of class 8. I am not understanding the concept of power rating of appliances. When we say that a bulb is rated 220V-100W, which means, according to ...
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### Volume distribution of charge in a wire in a DC circuit

According to this and several other articles some amount of charge in a DC circuit distributes itself on the surface of the conductor, making the electric field inside parallel to the said surface. ...
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### Why don't positively charged metal ions (in a wire) move but electrons do?

I'm very confused on this question. I've researched online but I can't seem to find the answer anywhere: all I was told was that electrons move (as part of electron flow) towards the regions of high ...
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### Charge conservation in ohmic material - Apparent paradox

Consider an ohmic material with constant conductivity, which obeys the relation: $$\vec J = \sigma \vec E$$ where $\vec J$ is the current density and $\sigma$ is the conductivity. Applying the first ...
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### Self-Energy of a Conducting Shell based on Surface Charge Distribution

If a charge $q$ is given to a shell of radius $r$ (conducting or non-conducting) it's self-energy is $kq^2/2r$, $k$ being Coulomb's constant. But if the shell is conducting and the charge on the inner ...
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### Is charge an intrinsic property of matter? [duplicate]

Is charge an intrinsic property of all the particles that comprise matter or is it an intrinsic property limited to certain fundamental particles only?? Or the question can be revised as "Does ...
1 vote
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### Uniqueness of charge distribution in conductor

I found out about a result describing the uniqueness of the charge distribution on a conductor. It says that for a given total charge on a conductor and a given charge distribution of the outside (...
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### How do charges on two conductors charged by the same battery relate to each other?

Let’s consider 2 neutral conducting spheres, L and R, with different radii. There is a battery somewhere in the middle between these spheres. The battery has potential $\phi_{B-}$ on its negative ...
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### Accumulated charge in conductors

Conductors placed in electric fields undergo a redistribution of charges. There is a separation of charges which occurs only on the surface. But what prevents the charge from leaving the surface of ...
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1 vote
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### Gauss's Law vs Image charges

Consider a grounded shell of radius $R$, inside is a point charge $q$ at a distance $a$ from the centre. Now, this charge would induce an amount of charge $-q$ on the conductor, whose field would be ...
1 vote
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### Potential on conducting shell without image charge

Edit 2: I know how image charges work. But I'm still trying to rationalize without it. Edit 1: scrap this, realized what I needed was image charges. This entire question is sort of a jury-rig ...
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### A General Analysis of Charge Distribution inside conductors

I'll go ahead and present my question straight-forward and then talk about the calculation details.My Question is: how do you define a conductor in Electrostatics? What are the basic(minimum) set of ...
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### Dirac's quantisation condition and non-quantised charge

After some time searching for a convincing demonstration of the Dirac quantisation condition, I've finally come across not one but three of them in David Tong's book: Gauge Theory. Nonetheless, it all ...
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### Why does charge reside on the outer surface for a conductor but inside in case of an insulator? [duplicate]

So from what I understood, in case of a conductor there are free electrons and when its charged there is maximum repulsion between the like charges which causes the electrons to reside on the surface ...
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### What are the limitations of Nodal Analysis?

Yea, that's the question basically. What are the limitations of Nodal Analysis? Like, for example take the following case, we have to find out the net capacitance between A and B. Now I want to solve ...
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### Induced charges due to uniform electric field

Suppose there is a finite metallic conductor placed in a uniform electric field. Will the magnitude of positive or negative charge induced on it depend on its shape or will it only depend on the ...
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### Total charge on a polarized neutral dielectric

I'm going through Griffith's EM book right now and from problem 4.14 we can see that the total charge on a polarized neutral dielectric is 0 (since it is neutral) the polarization may move around some ...
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### Is Coulomb's law wrong?

Recently I was reading about Coulomb's law which states that: "Magnitude of the electrostatic force F between two point charges $q_1$ and $q_2$ is directly proportional to the product of the ...
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### Equipotential surface of Hemispherical charge distribution

I was attempting a question of electrostatics from the book Pathfinder for Olympiads and Jee advanced Physics. In a solution of certain question, the base of a uniform hemispherical charge ...
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### What would happen to a system of two identical charges one with velocity $v$ and other at rest given unlimited time?

Two identical charged particles one having velocity $v$ and other starts from rest along a straight line. What would happen given an unlimited time? I think the charge initially at rest should keep on ...
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### Does QED explain why Moving charge produce magnetic field? [closed]

I wonder that moving charge produce magnetic fields. Now a days quantum field theory explain much of particle physics their underlying mediate particles. But can QED explain why moving charge produce ...
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### Radiation from accelerated charged in a co-accelerated reference frame

I was wondering if I sit on a accelerated charge particle I will not observe radiation since the particle is at rest according to me. But my friend observes it from outside and he will see radiation ...
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Can two positive conductors attract each other in some cases? In my opinion, let me denote the two conductors by $Q_1,Q_2>0$. Suppose $Q_1>>Q_2$ and $Q_2$ is really small. Let a tip of $Q_1$ ...