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The output resistance is given by _________

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The output resistance is given by _________

(a) ∆VCE/∆IB

(b) ∆VBE/∆IB

(c) ∆VBE/∆IC

(d) ∆VCE/∆IC

I have been asked this question during an interview.

Query is from The CE Characteristics in division Transistor Characteristics of Electronic Devices & Circuits

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Right option is (d) ∆VCE/∆IC

Easiest explanation: The ratio of change in collector emitter voltage (∆VCE) to resulting change in collector current (∆IC) at constant base current (IB) is defined as output resistance. This is denoted by ro.

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