本题目来源于试卷: Electrostatic Force and Electric Field，类别为 美国物理杯赛(Physics Bowl)
[单选题]
17.43: A semi-circle has 58fptvxa+z ;z a7 y;k,kja km1 radius R, total charge Q, and a charge per unit length kajak,y1 7;mk given as $λ=λ_0cosθ$ with θ defined in the figure and $λ_0$ a positive constant. Which one of the following choices gives the electric field strength at the point labeled P?
A. 0
B. $\frac{2k_eλ_0}{R^{2}}$
C. $\frac{k_eQλ_0}{R}$
D. $\frac{2K_eQλ_0}{\Pi;R^{2}}$
E. $\frac{\Pi;k_eλ_0}{2R}$
参考答案: E
本题详细解析:
暂无
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