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試卷名稱：113年 - 113 國立清華大學學士後醫學系單獨招生考試_學士後醫學系/智慧資訊科技組:資訊科學#119923
年份：113年
科目：學士後西醫◆資訊科學
14. There is an electric dipole in an external uniform E-field, as shown below. 
Examine the following expression for the work done on the dipole: 
where U(θ)=0 as θ=π/2.
(A) This expression is correct
(B) The negative sign after the second equal sign is wrong
(C) The negative sign after the last equal sign is wrong
(D) Both negative signs should be removed
(E) The dipole has a maximum potential cnergy when it is parallel to 
(namely,θ=0)
