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RL Circuit

198
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1. Homework Statement
http://img134.imageshack.us/img134/8382/circujitqt7.th.jpg [Broken]

i0(0) = 10 A
i1(0) = 20 A
The currents through the inductors flow from top to bottom. And v(t) is + on top and - on bottom
2. Homework Equations



3. The Attempt at a Solution

Find the voltage v(t) over both inductors.
Since the current going through both inductors is 30 amps total, I get 30*48 ohms
v(t) = [tex]1440 e^(-600t) [\tex]
unfortunately, according to my book it's -1440 for the coefficient, what am I doing wrong?
I really don't see why it would be negative, both of the currents are flowing in the same direction
 
Last edited by a moderator:

Answers and Replies

454
0
The current going through the resistor is going from bottom from top. So the bottom must be more positive than the top
 

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