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MIT 6.002 Circuits and Electronics, Spring 2007 12 Online
OpenStudy (anonymous):

Can someone tell me how to use Node Voltage to solve this problem? I am not sure why the one node is labeled as a variable and not the value of 2.5 Please see picture attached.

OpenStudy (anonymous):

OpenStudy (kenljw):

If you just consider the Op-Amp gain Rf/Ri = 10K/5K = 2 you should be able to see the result. Must use the basic assumption V(+) - V(-) = 0

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