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A change in 300mV in base emitter voltage causes a change of 100µA in the base current. Determine the dynamic input resistance.

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A change in 300mV in base emitter voltage causes a change of 100µA in the base current. Determine the dynamic input resistance.

(a) 20kΩ

(b) 10kΩ

(c) 30kΩ

(d) 60kΩ

I had been asked this question during an interview for a job.

I need to ask this question from The Common Collector Configuration topic in section Transistor Characteristics of Electronic Devices & Circuits

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The correct option is (c) 30kΩ

Explanation: ro=∆VBE/∆IB

=300m/100µ=30kΩ.

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