Determine the reactance of a 10 mH inductor at (a) 100 Hz and (b) at 10 kHz.
(a) at 100 Hz
X_L = 20 × 100 × 10 × 10^{-3}= 6.28 Ω
(b) At 10 kHz
X_L = 20 × 10 × 103 × 10 × 10^{-3}= 628 Ω