ELEC 226, Spring 2011
Prof. Rich Kozick

Homework 5 Answers

Please be sure to clearly show your work in the solutions that you submit. Your approach is much more important than obtaining the correct numerical answer.

Problem 13.1: The equations derived in class should be (please check your notes)

Using M=0.2 H as in the text, your solution should be .

However, this value of M corresponds to coupling coefficient k=2, which is impossible!

If you redo the problem with k=1 and M=0.1 H, then and P_L = 5.2 W.

Problem 13.10: k is between 0.8 and 0.9.

Problem 13.14: Z_in = 10.32 – j 0.24 ohms (and you should be able to check your Z_R answer from this)

Problem 13.22: V

Problem 13.23: S = 49.7 – j 19.9 mVA

Problem 13.26: Average power = 0.64 W

Problem 13.27: Z_in = 260 – j 80 ohms (Corrected at 9:45 PM on March 28, 2011.)