.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 ideal ammeter, a swia4 dt(, 9+ mxcfchmyx+tch and tzs7x* sb0rs r-dskf lk;92.w phree resistors are conne-2b;s 9p.xd7szf s *0wskr rklcted as shown. With 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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