There are two mesh currents. Let's do clockwise mesh current i1 around the left window pane and clockwise mesh current i2 around the right window pane. Then the mesh current equations in the time-domain are: Notice that because of the current source in the middle, we must define an unknown voltage vx across it. We also needed an extra equation (defined by that current source).
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© 2012, Steven H. VanderLeest