--Inductors (id: f970895d9)

本题目来源于试卷: --Inductors，类别为 美国物理杯赛(Physics Bowl)

[单选题]
08.41: The circuit shown has been operating for a l9 ilu(qt /u7gl0ebl0 hong time. The instal 4/7lr cn7rih),kjrr x6wpi.-9y z/0nhl hnznt after the switch in the circuit labeled S is opened, what is the voltage across7l 6n .4r/knhczxl-9r wnh70)ri , lpyjzi/rh the inductor $V_L$ and which labeled point (A or B) of the inductor is at a higher potential? Take $R_1\:=\:4.0\Omega$, $R_2\:=\:8.0\Omega$, and L = 2.5H.

A. $V_L$ = 30V; Points A and B are at equal potentials.
B. $V_L$ = 12V;Point A is at the higher potential.
C. $V_L$ = 12 V;Point B is at the higher potential.
D. $V_L$ = 6V;Point A is at the higher potential.
E. $V_L$ = 6V;Point B is at the higher potential


参考答案:  E


本题详细解析: 暂无

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