3 votes

Electric displacement field in a conductor

I believe the questions stems from viewing $\vec{E}$ and $\vec{P}$ as independent. But $\vec{P} = \epsilon_0 \chi \vec{E}$ Thus: $\vec{D} = \epsilon_0\vec{E}+\epsilon_0 \chi \vec{E}=\epsilon_0 (1+\chi)...
Daniel's user avatar
  • 266
2 votes

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 ...
my2cts's user avatar
  • 23.8k
2 votes

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 ...
Albertus Magnus's user avatar
2 votes

Field outside a hollow conductor

Feynmann is right that no static charge distribution inside a hollow grounded conductor produces any field outside the conductor. As far as Gauss' law goes, because the conductor is grounded, i.e. ...
Albertus Magnus's user avatar
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 ...
Jos Bergervoet's user avatar
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 ...
Brian Bi's user avatar
  • 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 ...
Devansh Mittal's user avatar
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 ...
Daniel's user avatar
  • 266

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