What Resistance Must Be Put in Series with A $30 - \mathrm { mH }$

question 49

Multiple Choice

What resistance must be put in series with a $30 - \mathrm { mH }$ inductor at $4000 \mathrm {~Hz}$ to have a total impedance of $8.0 \times 10 ^ { 4 } \Omega$ ?

• A) \(6.0 \times 10 ^ { 4 } \Omega\)
• B) \(7.0 \times 10 ^ { 4 } \Omega\)
• C) \(30 \times 10 ^ { 4 } \Omega\)
• D) \(8.0 \times 10 ^ { 4 } \Omega\)
• E) \(5.0 \times 10 ^ { 4 } \Omega\)