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The input resistance in a CB transistor is given by _________

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The input resistance in a CB transistor is given by _________

(a) ∆VCE/∆IB

(b) ∆VBE/∆IB

(c) ∆VBE/∆IC

(d) ∆VEB/∆IE

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The query is from The CB Characteristics in portion Transistor Characteristics of Electronic Devices & Circuits

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Right option is (d) ∆VEB/∆IE

Easy explanation: The ratio of change in emitter base voltage (∆VEB) to resulting change in emitter current (∆IE) at constant collector base voltage (VCB) is defined as input resistance. This is denoted by ri.

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