Increase in internal energy due to polarization of a dielectric

AI Thread Summary
The discussion centers on the effect of dielectric polarization on the internal energy of a plate capacitor when immersed in a dielectric fluid. The initial assumption that the polarization does not significantly change the internal energy is challenged. It is argued that modeling polarization as a density of dipoles reveals that their energy is influenced by the electric field. Therefore, the assumption is deemed unreasonable. Understanding the relationship between dielectric polarization and internal energy is crucial for accurately determining the fluid height in the capacitor.
Fibo112
Messages
149
Reaction score
3
I have a plate capacitor with a given charge. It is then dipped in a dielectric fluid and I must determine which height the fluid reaches(all the necessary parameters are given). I can solve this problem if I make the following assumption: the polarization of the dielectric does not( or approximately does not) change its internal energy.

Is this a reasonable assumption? If so why?
 
Physics news on Phys.org
Fibo112 said:
Is this a reasonable assumption?
No, it isn't. If you model polarisation P as a density of dipoles, what will be their energy in an electric field?
 

Thread 'Reflections at the source point of a transmission line'

I was using the Smith chart to determine the input impedance of a transmission line that has a reflection from the load. One can do this if one knows the characteristic impedance Zo, the degree of mismatch of the load ZL and the length of the transmission line in wavelengths. However, my question is: Consider the input impedance of a wave which appears back at the source after reflection from the load and has traveled for some fraction of a wavelength. The impedance of this wave as it...
View full post »

Similar threads

I Is capacitor energy the electrostatic energy of the whole system?
Replies
9
Views
2K
I How Do Dielectrics Influence Electric Flux Density in Electromagnetic Theory?
Replies
5
Views
2K
Energy changes upon insertion of a solid dielectric in a capacitor
Replies
2
Views
2K
Help clarifying capacitors, dielectrics, E field, potential
Replies
2
Views
1K
How does dielectric heating actually work?
Replies
1
Views
2K
Polarization charge density of homogeneous dielectric
Replies
3
Views
3K
Dielectric Polarization Components in Ideal RC and C circuits
Replies
2
Views
2K
Confused by capacitors and potential energy
Replies
7
Views
8K
A Variation of Energy for Dielectrics (Zangwill's Electrodynamics)
Replies
3
Views
1K
Why is there force on a dielectric inserted into a capacitor
Replies
1
Views
1K

Hot Threads

Recent Insights

Back
Top