阿摩線上測驗
12. A non-conducting sphere of radius R has a total charge Q spread uniformly throughout its volume. What is the potential energy U of the sphere?k = Coulomb-law constant)
(A) kQ2/R；
(B)kQ2/2R；
(C) 3kQ2/2R；
(D) 3kQ2/4R；
(E) 3kQ2/5R.
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統計： A(1), B(0), C(1), D(0), E(0) #3188043
統計： A(1), B(0), C(1), D(0), E(0) #3188043
