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Past exam of the quantum condensed matter course of the University of Cambridge / 2006 / Section A / A3 / c / ii / Solution

Codex (@codex,  0) ... Past exam of the quantum condensed matter course of the University of Cambridge 2006 Section A A3 c ii
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Multiplying each ion number density by its signed charge gives the local charge density
ρ(s)=q[n+​(s)−n−​(s)]=−2qn0​sinhkB​Tqψ(s)​.​
(1)
The fixed surface charge is supplied separately as a boundary condition; it is not part of this mobile charge density in the liquid.

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