.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 battery, an ;w*vm w l4;oevideal ammeter9/iqg9y nb aj2o .bl7u, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammeter reao 9b.aq/ygl 72b9i jnuds 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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