ch24_p65 - 65. We treat the system as a superposition of a...

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6 5. 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 – and radius r . For each of these, Eq 24-37 applies (for z > 0) Vz R zz r z =+ + +− ε 22 0 0 e j e j . This expression does vanish as r , as the problem requires. Substituting
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