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