# Tag Info

### Charge distribution: electrostatic equilibrium in conducting sphere

In the hollow interior of a conductive sphere, we can create the same type of unstable equilibrium situations that we know from empty space. For instance two positive point charges $q$ and a third one ...
1 vote

### Could you calculate the force between two NON-PARALLEL, straight current carrying wires?

Assuming we already know how to calculate the $B$-field of one infinite straight wire, we only need the integral of its force over the second wire. Without loss of generality we can assume that the ...
Accepted

### How does charge move in conducter which is between two connected conductors

You can treat this as two parallel capacitors. One between the top plate and the top of the middle plate, and one between the bottom plate and the bottom of the middle plate. Since the dielectric ...
• 27.1k

### Why do charges uniformly distribute themselves on the surface of a conducting sphere with a charge inside its cavity?

A very simple answer is follow the logic: It's undeniable that the charge q in the cavity attracts electrons in the conductor to the surface of the cavity. These electrons repel each other so they ...
• 553
1 vote

### Why is there a band gap in semiconductors but no band gap in conductors?

The reason is that in semiconductors the valence electrons form chemical bonds between neighbouring atoms, while in conductors the valence electrons only collectively bind the atoms together by ...
• 23.8k
1 vote

### Charge Inside a conducting hollow sphere

The electrons in the inner sphere will rearrange themselves so as to shield the inside from any static electric field produced by charges outside it. The electrons in the outer sphere will also do the ...
• 6,396
1 vote

### Charge Inside a conducting hollow sphere

The net electric field inside the inner conductor will be zero. You are correct there. The electric field outside the inner sphere and inside the outer sphere (R1<r<R2) will be non-zero. The ...
• 2,197

### Charge Inside a conducting hollow sphere

Since the problem's geometry consists of two concentric spheres, one can apply Gauss' law, $$\oint_S \vec E\cdot n\;dA={Q_{enclosed}\over \epsilon_0};$$ to great effect in analyzing the electric field ...
• 1,471

### Electric displacement field in a conductor

This is a result of the electrostatic balance of a conductor. First, it is obvious that $\mathbf{E}$ inside the conductor is zero, because any tiny electric field will cause the motion of the free ...

### Electric displacement field in a conductor

I think that in this case it can be quite useful to revisit the microscopic interpretation of polarization in classical electromagnetism. In a dielectric material with no external electric field we ...

### What is the electric field inside a perfect conductor connected to a DC source?

"Now imagine the same perfect conductor is connected to a DC voltage source by "perfectly conducting wires." That is called a short circuit. There will initially be a huge electric ...
• 1,468
1 vote

### Why force by electric field is appearing?

The Lorentz force creates makes for an excess of positive charge at the top (ceiling) of the wire (electrons travel up from the floor to the ceiling of the wire). At equilibrium: Lorentz force pushes ...
• 266

### Electric displacement field in a conductor

My original answer was wrong, so I am replacing it with this answer (in Gaussian units), which I believe is correct. In a dielectric with a permanent polarization, $\bf P$, any electric field will ...
• 1,468