# Questions tagged [dielectric]

This tag is for questions relating to a non-conducting material called dielectric (or dielectric material). Dielectrics are very much important to explain various phenomena in various fields of physics like solid-state physics, optics, electronics, cell biophysics, etc.

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### Snell's law for the $D$ field

I always see Snell's law $$n_1 \sin(\alpha_1) = n_2 \sin(\alpha_2) \tag{1}$$ for the electric field $E$ without any words mentioned of the electric displacement field $D$ which is also required for ...
1 vote
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### A capacitor partially filled with dielectric [closed]

Assume a parallel plate capacitor that was charged up to $Q_0$ from a source $U_0$ and then disconnected from the voltage source. The plates have an area $A$ and the distance between the plates is $d$....
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### Do conductors have bound charges?

In Griffiths, the total charge density of a dielectric is: $\rho$ =$\rho_b +\rho_f$. I have several questions: Can the total charge density of a conductor be written as the equation above? Do the ...
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### Energy in Dielectric Medium as a Sea of Dipoles

Simply, why is the energy density in a dielectric medium = $\frac{1}{2}K\epsilon_oE^2$ where K is the dielectric constant of the dielectric medium? Working proof Consider a capacitor that is charged ...
32 views

### 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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### Why is potential continuous at dielectric conjunction?

Lets take for an example, a spherical capacitor with two dielectrics. The Electric Field will then be given by $$\frac{Q}{4\pi\varepsilon_0\varepsilon_r r^{2}}$$ We know that then the electric field ...
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### Does an electric arc formed in air create more heat than in neon or argon?

When you create an arc in the air it becomes several thousand degrees and is hot enough to weld with. However, plasma arcs in neon/argon are cool to the touch, and are used for neon lighting and small ...
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### Effects of dielectric on force between charged bodies?

The electrostatic force between the plates of a charged isolated capacitor remains unchanged when dielectric fills whole space between plates. But when we take 2 isolated point charges in a dielectric ...
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### What are the conditions under which these equations hold for dielectric and magnetic materials?

$E_0 = \frac{D}{\varepsilon_0}$, $E' = -\frac{P}{\varepsilon_0}$ $B_0 = \mu_0 \cdot H$, $B' = \mu_0 \cdot M$ （$E_0$ refers to the electric field generated by free charges, or the external electric ...
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### Field due to an infinite sheet of charge with dielectric on one side

Suppose you have a surface charge density $\sigma$ on a conducting plane $z=0$. The region $z<0$ is filled with a dielectric of permittivity $\varepsilon$. What is the field everywhere? I tried ...
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### Derivation of the quantization of the EM field in a dielectrics

I'm currently studying the quantization of the EM field in a dielectric medium and trying to understand the quantization scheme of Huttner and Barnett (1992, see Phys. Rev. A 46, 4306). The system ...
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### Frequency dependency of dielectric constant

The graph of dielectric constant is not linear with respect to increasing frequency. Polarization mechanism cannot keep with the frequency, and hence the dielectric constant abruptly drops. I get ...
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### Is it necessary that an Electric Field becomes $1/K$ times inside a dielectric in all cases?

Suppose in space, there is an electric field. Now we introduce a dielectric medium in space with dielectric constant $K$. Is it necessary that an Electric Field will become $1/K$ times inside a ...
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### Electric field due to bound charge on surface of dielectric material

I got stuck on a step in Example 4.8 of Griffiths. It places a charge $q$ a distance $d$ above an infinite linear dielectric material. The Problem It states the the field due to the bound charge $σ$ ...
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### Force on dielectric while entering a capacitor - Connected to battery

I had seen a similar question to this as below. However it considers a charged capacitor disconnected from a voltage source. Force on dielectric slab As per my understanding from the comments, the ...
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