Discussion
What is input bias current?
Answer: B
Bias current is the average of the two base currents, and it flows through whatever resistance is connected to each input, developing a voltage there. The difference between them is the offset current, a separate and usually much smaller specification. Tail and collector currents are internal. Because the bias current develops a voltage across the source resistance, matching the resistances at the two inputs cancels most of its effect. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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