本题目来源于试卷: .Resistor.,类别为 美国物理杯赛(Physics Bowl)
[单选题]
02.21: An ideal battery, an b3vvy/(is6i qideal ammeter, a switch an 5x n6jjxe83ybm z dur s2dg3*us+4g2 kd three resistors are connected a de532 umrj dk34 nj6ubysgz*x82sxg+ s shown. With the switch open as shown in the diagram the ammeter reads 2.0 amperes.
With the switch open, what would be the potential difference across the 15 ohm resistor?
A. $30 V$
B. $40 V$
C. $60 V$
D. $70 V$
E. $110V$
参考答案: A
本题详细解析:
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