P25_018 - 18. (a) The charge on the sphere is q = 40 V R =...

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18. (a) The charge on the sphere is q =4 πε 0 VR = (200 V)(0 . 15 m) 8 . 99 × 10 9 N · m 2 C 2 =3 . 3 × 10 9 C . (b) The (uniform) surface charge density (charge divided by the area of the sphere) is
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