The variable dc current source in the circuit shown below is adjusted so that the power developed by the 40mA current source is zero. a) Would you use the node-voltage or mesh-current method to find idc?Explain your choice. b) Find the value of idc using the method selected in (a).

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A: This is a basic problem of analog circuit. The detail solution is given in the next step

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Q: 3. For the question above, find the current through the inductor

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Operational Amplifier

An operational amplifier also called op amp is an integrated circuit or analog circuit that takes input as a differential voltage and produces output as a single-ended voltage. It is an IC that can amplify weak electric signals.An op amp has one output pin and two input pins. The basic role of an opamp is to amplify the voltage difference between the two input voltages. It is also used in filtering or to perform mathematical operations or in signal conditioning.