ch23-p059

# ch23-p059 - Q ) within the conducting material, there must...

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59. The initial field (evaluated “just outside the outer surface” which means it is evaluated at r = 0.20 m) is related to the charge q on the hollow conductor by Eq. 23-15. After the point charge Q is placed at the geometric center of the hollow conductor, the final field at that point is a combination of the initial and that due to Q (determined by Eq. 22-3). (a) q = 4 πε ο r 2 E initial = + 2.0 × 10 9 C. (b) Q = 4 πε ο r 2 ( E final E initial ) = 1.2 × 10 9 C. (c) In order to cancel the field (due to
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Unformatted text preview: Q ) within the conducting material, there must be an amount of charge equal to Q distributed uniformly on the inner surface. Thus, the answer is +1.2 10 9 C. (d) Since the total excess charge on the conductor is q and is located on the surfaces, then the outer surface charge must equal the total minus the inner surface charge. Thus, the answer is 2.0 10 9 C 1.2 10 9 C = +0.80 10 9 C....
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