.Resistor. (id: 511353336)

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 4 cr6t0v79idg6:ant mrpn;ri , an ideal amm3zo cs )..x0z 2womaqgeter, a switch and three resistors are connected as shown. With the switch open as shown in the diagram the ammeter reads 2.0 ampere )m xosz..g0q32c wzoas.
With the switch open, what must be the voltage supplied by the battery?

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


参考答案:  D


本题详细解析: 暂无

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