50. What resistance should be added in series with a 3.0-H inductor to complete an LR circuit with a time constant of 4.0 ms?
(A) 20 Ω
(B) 0.75 kΩ  
(C) 12 Ω  
(D) 0.75Ω 
(E) 2.5Ω 

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統計: A(0), B(15), C(0), D(1), E(0) #3093891

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#7084512
題目解析 在LR電路中,時間常數(τ)...
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