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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Plz Calculate effective capacitance $K1,K2, K3$ are dielectrics [closed]
Three different dielectric
materials (constants K1, K2 and K3) have been used to fill the space between the plates of a parallel plate capacitor as shown in the figure. Each of the slabs having ...
0
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1
answer
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Is my Idea correct? About an electric field applied in a medium?
I think that, when the electric field is applied in a medium then, atoms of that medium become polarised. So, work is done to hold them like that, and energy of the electric field is consumed in this ...
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2
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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 ...
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1
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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 $d$....
- 23
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3
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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 ...
- 33
3
votes
1
answer
45
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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 ...
- 45
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3
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33
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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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1
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1
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Permittivity real and imaginary parts with similar value possible?
Here's the context; I'm studying biological tissues that are supposed to behave like dielectrics. Using the modified cole-cole equation for theoretical predictions:
$$\tilde{\varepsilon}_r (\omega )= \...
- 189
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1
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67
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Understanding dielectrics on the basis of induced charge and energy density
Simply, why is the energy density in a dielectric medium = $\frac{1}{2} K \epsilon_o E^2$?
For a simple case such as that of a capacitor with a dielectric medium inside it, to find the magnitude of ...
- 45
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36
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Displacement current and magnetic field in capacitor with dielectric
I have a capacitor with round plates of radius $r_{2}$ kept at a distance $d$, with a voltage $V\left(t\right) = V_{0} \cos \left(\omega t\right).$ Inside, there is cylindrical material with a certain ...
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Difference between polarization angle and poling angle in piezoelectric material
I was reading the research article: Demonstration of optimizing piezoelectric polarization in the design of a flextensional actuator, where I had confusion differentiating between poling angle, which ...
- 78
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3
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103
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What is the net macroscopic electric field at any point inside a dielectric?
This question is based on section 4.2.3 of Introduction to Electrodynamics by David J. Griffiths (Third Edition).
Consider a point $\vec{r}$ inside a dielectric where we are interested in finding the ...
- 11.8k
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1
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90
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Confusion on the definition of dielectric permittivity
I don't understand how we're defining the dielectric permittivity, sometimes it's defined as the ability of the material to resist the electric field and sometimes as the ability to permit the ...
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Is the capacitance obtained using the RC circuit equation the correct value?
To find the dielectric constant of the dielectric according to frequency, an RC circuit was constructed and the capacitance was calculated using the RC circuit equation using the voltage applied to R, ...
3
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1
answer
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Are superinsulators perfect dielectrics?
In Wikipedia its stated: "The phenomenon of superinsulation can be regarded as an exact dual to superconductivity."
I understand that superinsulators are terrible conductors. But its not ...
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