# Tag Info

### How to avoid the ordinary Coulomb solution in QCD?

First, I think your proposed current would break gauge invariance, but that's a relatively trivial problem in that I think you could reformulate your question getting around that issue. The bigger ...
• 51k
1 vote
Accepted

1 vote

### Electric field at a point due to dielectric inserted in between a parallel plate capacitor

The induced charges on the dielectric will attract the charges on the plates. Since the dielectric is inserted partially between the two plates, the charge on the plate near the dielectric will ...
• 513
1 vote

### Electric field at a point due to dielectric inserted in between a parallel plate capacitor

Consider the situation before the dielectric was introduced (left diagram) and after the dielectric was introduced (right diagram). There are two possible scenarios. The first is when the capacitor ...
• 97.9k

### Electric field at a point due to dielectric inserted in between a parallel plate capacitor

Let me ask , what is Electric field due to a single plate of charge of density $\sigma$ ? It's : $$E_{single}= \frac{\sigma}{2\epsilon_0}$$ Even though there is polarization of the dielectric , but ...
1 vote

### Will the electrical potential difference between the Windward and Leeward sides of a mountain range generate electrical current?

It is possible that a current could develop in your cable, but it won't be a steady current like you'd want to charge a battery. Humans have actually built quite a lot of conductors that stick into ...
• 1,220

### Understanding Symmetries and Invariances in Electrostatic Fields

The concept of symmetry plays an important role in all branches of Physics, and electrostatics is a good playground for developing an intuition on how symmetries works. A little disclaimer: I do not ...

### Why are fields described as force divided by mass or charge?

You are right in demanding a clear answer for this issue (in school, the teacher either can't answer or can't explain the thing). What is the difference between physics and philosophy if we are not ...

### How will the capacitance of a capacitor reduce when the distance between the plates is increased?

I know that we can prove capacitance is indirectly proportional to distance by the formula $C=\epsilon A/d$, but I am not understanding how the relationship between $C$ and $d$ came in place. ...
• 73.6k

### Electric dipole

To understand it intuitively I suggest that do not think of an ideal dipole, $\mathbf p$ as having zero length with infinite charges at its ends but rather in your mind visualize it as something ...
• 19.7k

### Electric dipole

Because that's how "Electric field" is defined. Specifically, ' its direction ' is defined as the direction in which force would act upon a positive charge placed at that particular point ...
Accepted

### Electric dipole

Charge is a scalar and field is a vector. $\vec{E}$ and $-\vec{E}$ are going to have different directions (multiplication of a vector by -1 changes it's direction.) Since the equation for the electric ...
• 978

### Field induced outside a grounded 2D circle conductor by an exterior point charge. A puzzle, not what you think!

Not all puzzles have a solution. Your hidden assumption is that there always should be a solution with the object's surface at the same potential as infinity, a situation we then define as "...
• 4,873

### How will the capacitance of a capacitor reduce when the distance between the plates is increased?

Physically, the Capacitance of the plates at a position is the magnitude of charge given to the plates to maintain a potential difference of 1 Volt. If the distance between the plates increases, the ...
• 160

### How will the capacitance of a capacitor reduce when the distance between the plates is increased?

Consider a charged, insulated capacitor. One plate carries Q1=Q and the other Q2=-Q. If you increase the distance between the plates you are increasing the distance between Q1 and Q1. This will ...
• 25.3k

### How will the capacitance of a capacitor reduce when the distance between the plates is increased?

Consider a capacitor with capacitance $C$ which has a charge $Q$ when the potential difference is $V$ and $Q=CV$. Now assume a second identical capacitor with charge $Q$ and potential difference $V$. ...
• 97.9k

### How will the capacitance of a capacitor reduce when the distance between the plates is increased?

"I know that if the potential difference between the plates increase that capacitance will reduce" This is not generally true... Capacitance is defined as $C=\tfrac QV$ in which $Q$ is the ...
• 36k
1 vote

### How will the capacitance of a capacitor reduce when the distance between the plates is increased?

Now I know that if the potential difference between the plates increase that capacitance will reduce Ideally, this is not the case. Capacitance depends on the geometry of the conductors, not the ...
• 57.2k
Accepted

### Maxwell stress tensor on a capacitor late given a dielectric

I figured out the answer to my question! Although I couldn't find any reference to the Maxwell stress tensor in a dielectric in my normal Griffiths textbook, I found that "Electrodynamics of ...
1 vote
Accepted

• 32.9k

### Does cutting out the surfaces with no surface charge affect the charge distribution on the remaining parts of a conducting surface of arbitrary shape?

Actually, I doubt that there can be zero charge density areas of a charged conducting surface (at least if the surface is connected): if there were such an area, why wouldn't the charge get ...
• 27.1k
Accepted

### Does cutting out the surfaces with no surface charge affect the charge distribution on the remaining parts of a conducting surface of arbitrary shape?

Removing the uncharged parts of a charge distribution would not change the field configuration elsewhere. To show this, start with the Poisson equation (assuming the permittivity $\epsilon_0$ is the ...