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A 16 ohm resistor is in series with a 85-mH inductor and an ac source.

A) Calculate the impedance of the circuit if the source frequency is 75Hz

B) Calculate the impedance of the circuit if the source frequency is 4.2ï¿½104Hz .
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Added Mon, 03 Aug '15
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Z = R + j w L

If frequency is 75 Hz

Z = 16 * 10^3 + j ( 2 * pi * 75 * 85* 10^-3)

= 16000 + j 40.055

|Z| = 16000.05 Ohms

f = 4.2 * 10^4 Hz

Z = 16 * 10^3 + j ( 2 * pi * 4.2 * 10^4 * 85* 10^-3)

= 16000 + j 22430.97

| Z | = 27552.65 Ohms
Edit
Added Mon, 03 Aug '15
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