选项
A.
A.$U_{max}=dfrac{E_{max} r_{0}}{4} ln dfrac{{R_2}^{2}}{R_1 r_0}$
B.
B.$U_{max}=dfrac{E_{max} r_{0}}{2} ln dfrac{{R_2}^{2}}{R_1 r_0}$
C.
C.$U_{max}=dfrac{E_{max} r_{0}}{4} ln dfrac{{R_1}^{2}}{R_2 r_0}$
D.
D.$U_{max}=dfrac{E_{max} r_{0}}{4} ln dfrac{R_2}{R_1 r_0}$
正确答案：B
名词解析
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