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Electrostatic energy of a dielectric sphere 
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#1
Oct1009, 05:40 PM

P: 176

1. Find the electrostatic energy of a neoprene sphere or ratio R, charged with Q if:
a) Q is uniformly distributed in surface 3. The attempt at a solution So, I can calculate the displacement field (so that I can use the expresion U= [tex]\int \vec{D}.\vec{E} dV[/tex]), but only for those points in space where r>R. Then, given that D=[tex]\epsilon[/tex]E, I can find the electric field for r>R. But I don't know how to get the electric field inside the sphere, since D=0 there because there're no free charges inside. It could also happen that E doesn't exist inside the sphere either, but I woundn't know the reason why. Any ideas? Thanks. 


#2
Oct1109, 10:13 AM

P: 176

Anybody?



#3
Oct1109, 04:20 PM

P: 176

Does anybody know how I can get P of polarization?



#4
Oct1209, 06:10 AM

HW Helper
P: 5,003

Electrostatic energy of a dielectric sphere



#5
Oct1209, 08:41 AM

P: 176

Yes, thank you. I thought I had to find the polarization vector P.



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