39. If the electric field is in the positive x direction and has a magnitude given by E = Cx2, where C is a constant, then the electric potential is given by V =
(A) 2Cx
(B) -2Cx
(C) Cx3/3
(D)- Cx3/3
(E) -Cx3.

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統計: A(0), B(1), C(3), D(14), E(0) #3093880

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