P24_061 - 61. (a) For r < R, E = 0 (see Eq. 24-16). (b)...

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61 .( a )F o r r<R , E = 0 (see Eq. 24-16). (b) For r slightly greater than R , E R = 1 4 πε 0 q r 2 q 4 πε 0 R 2 = (8 . 99 × 10 9 N · m 2 / C 2 )(2 . 0 × 10 7 C) (0 . 25 m) 2 =2 . 9 × 10 4 N / C . (c) For r>R , E =
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