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