Dipole in electric field, capacitor

AI Thread Summary
A parallel plate capacitor filled with 0.3 cm of distilled water has a dipole moment of 6.1 x 10^(-30) C.M, with all dipoles aligned to the electric field. The discussion focuses on calculating the surface charge density of bound charges on the water layer, using the dielectric constant of water, which is 80. Participants express frustration over the application of the dipole moment in the context of energy relations and existing formulas. The key formula for surface charge density is acknowledged, but users seek a deeper understanding of how to approach the problem effectively. The conversation highlights the challenge of integrating dipole moments into capacitor calculations.
burak_ilhan
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a parallel plate capacitor is filled with a layer of distilled water of 0.3cm tihck. The dipole moment of a water molecule is 6.1*10^(-30) C.M. Assume that the dipole moments of the water molecules are all perfectly aligned with the electric field. What is the surface charge density of bound charges on the surface of the layer of water.(dielectric constant of water:80).

Well, I solved lots of problems like that except with a dipole moment. I don't know where to use that. I tried to use some energy relations but no results. Thanks for any help.
 
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surface charge density \sigma
\sigma _{bounded} = \sigma _{free} [ 1-\frac{1}{\epsilon _{r}}]
 
Thanks but I know that formula, and I bet everybody knows... I need a way to solve the problem.:)
 

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