Answer to Question 6

 

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At a certain frequency, a inductor has a reactance of 20 ohms. It is in series with a resistor of 10 ohms. What is the impedance? What is the phase angle between the resistance and the impedance?

  Z2 = (20 W)2 + (10 W) 2 = 500 W2

 Z = 22 W

 cos f = R/Z = 10 W 22.4 W = 0.446

 f = cos-1 0.446 = 63o