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Which parameter of the physical model is varied while measuring the output characteristics of a common-base transistor?

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Which parameter of the physical model is varied while measuring the output characteristics of a common-base transistor?

(a) Emitter current

(b) Emitter voltage

(c) Collector current

(d) Collector base voltage

I have been asked this question by my school teacher while I was bunking the class.

This intriguing question originated from Physical Model of a CB Transistor topic in section Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

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Right answer is (d) Collector base voltage

Explanation: To determine the output characteristics, the emitter current is kept constant at zero and the collector base voltage is increased from zero volts to varying voltage levels. For each voltage level of the output voltage, the collector current is recorded.

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