阿摩線上測驗
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12. The figure shows (in cross section) a metal sphere with a hollow. A particle of charge -8.0Q is at the center of the sphere (at the center of the hollow). The metal of the sphere has a net charge of -12Q. What is the charge on the outside (external) surface of the sphere?
(A) +4.0Q (B) +8.0Q (C) -20Q (D) 0 (E) -4.0Q