The subsequent problems deal with the circuit below where the op amps are LM741's powered by a ±15 V power supply. Assume R1 = R2 = R3 = R4 = R. Assume the op amps are ideal.
If V2 = 10 V, I4 is
A. 10 / R
B. 10 / 2R
C. 10 R
D. 0
E. 10 / 3R
Answer: A
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