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A change in 700mV in base emitter voltage causes a change of 200µA in the base current. Determine the dynamic input resistance.

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A change in 700mV in base emitter voltage causes a change of 200µA in the base current. Determine the dynamic input resistance.

(a) 2kΩ

(b) 10kΩ

(c) 3kΩ

(d) 3.5kΩ

The question was asked in an interview for internship.

This intriguing question comes from The CE Characteristics topic in division Transistor Characteristics of Electronic Devices & Circuits

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The correct option is (c) 3kΩ

To elaborate: ro=∆VBE/∆IB

=700m/200µ=3.5kΩ.

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