ch22-p020 - ⎠ ⎟ ⎞ 1 − d z 3 4 d 2 z 2 − 1 2 d 3 z...

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20. Referring to Eq. 22-6, we use the binomial expansion (see Appendix E) but keeping higher order terms than are shown in Eq. 22-7: E = q 4 πε o z 2 1 + d z + 3 4 d 2 z 2 + 1 2 d 3 z 3 + …
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Unformatted text preview: ⎠ ⎟ ⎞ 1 − d z + 3 4 d 2 z 2 − 1 2 d 3 z 3 + … = q d 2 πε o z 3 + q d 3 4 πε o z 5 + … Therefore, in the terminology of the problem, E next = q d 3 / 4 πε z 5 ....
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