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GreenPrint
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Homework Statement
http://img801.imageshack.us/img801/4227/capturebsw.png
Homework Equations
The Attempt at a Solution
Alright I'm not really sure how to solve this problem. I have redrawn the circuit below without the operational amplifier. In ideal operation amplifiers there's no current going into the positive and negative inputs and the voltages are also the same.
http://img254.imageshack.us/img254/963/capturenpcq.png
My initial thoughts to solving this problem was to use KCL. I'm however unsure how to do this in this situation. [itex]I_{1}[/itex] is both entering and leaving the upper node at 0 V and [itex]I_{f}[/itex] is entering the node. So does this mean that [itex]I_{f}[/itex] is zero?
Thanks for any help you can provide.
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