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Homework Statement
Find the input impedance [tex]Z[/tex]. (i.e. Find [tex]Z[/tex] equivalent.)
Answer in the back of the book: [tex]Z=84.907-j20.12[/tex] ohms
[PLAIN]http://img834.imageshack.us/img834/8508/circuit.png
Homework Equations
n/a
** [tex]j=sqrt(-1)[/tex]
The Attempt at a Solution
I combined the 60-ohm, 50-ohm, and -j90 ohm resistors in parallel to get:
[tex]\frac{29700}{1189}-\frac{9000 j}{1189}[/tex]Then, I combined that impedance with the j50 to get:
[tex]\frac{2700}{184009199}+ \frac{3681000 j}{184009199}[/tex]Adding that to the 15- and 100-ohm resistors, I get the wrong answer.
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