.Resistor. (id: 1ea595757)

本题目来源于试卷: .Resistor.，类别为 美国物理杯赛(Physics Bowl)

[单选题]
02.22: An ideal battery0upc 876 h ,kxuy1j9fkyo6ylu , an ideal ammeter, a switch and three resistors a02 0cf:ub)n+bo j /(ouxtnovtre connected as shown. With2oobo (tnx+tfu v/u00:bnc j) the switch open as shown in the diagram the ammeter reads 2.0 amperes.
With the switch open, what must be the voltage supplied by the battery?

A. $30 V$
B. $40V$
C. $60V$
D. $70V$
E. $110V$


参考答案:  D


本题详细解析: 暂无

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