.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, an ideal ammetp8fx r01 wp+ukeay7gl q z s3ya;l)i)1wr, a switch and three resistors are conneyw)g s7qyz; 3a1li)lacted 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. $40 V$
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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