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【单选题】
如图所示,在 xOy 平面内有一个以 O 为圆心、半径 R = 0.1 m 的圆, P 为圆周上的一点, O 、 P 两点与 x 轴正方向的夹角为 θ . 若空间存在沿 y 轴负方向的电场,场强大小 E = 100 V/m ,则 O 、 P 两点的电势差可表示为 ( )A.
U OP ＝－ 10sin θ (V)
B.
U OP ＝ 10sin θ (V)
C.
U OP ＝－ 10cos θ (V)
D.
U OP ＝ 10cos θ (V)
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【简答题】Research Proposal.docx Please download Research Proposal in the attachment and fill out the form.
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