Impedance: What resistance must be put in series with a 30-mH inductor at 4000 Hz to have a total impedance of 8.0 × 104 ??
A. 30 × 104 ?
B. 5.0 × 104 ?
C. 6.0 × 104 ?
D. 7.0 × 104 ?
E. 8.0 × 104 ?
Answer: E
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