P25_058 - 58. We treat the system as a superposition of a...

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58. We treat the system as a superposition of a disk of surface charge density σ and radius R and a smaller, oppositely charged, disk of surface charge density σ and radius r . For each of these, Eq 25-37 applies (for z> 0) V = σ 2 ε 0 ³ p z 2 + R 2 z ´ + σ 2 ε 0 ³ p z 2 +
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