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In the given circuit, find the equivalent resistance between A and B nodes.

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In the given circuit, find the equivalent resistance between A and B nodes.

(a) 100kΩ

(b) 50kΩ

(c) 40kΩ

(d) 60kΩ

I had been asked this question in an internship interview.

The above asked question is from The AC Analysis of a Small-Signal Low-Frequency Common Emitter Transistor. topic in division Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

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Best answer
Right choice is (b) 50kΩ

Best explanation: RAB=RO||100Ω

= (RS^I+hie/1+hfe)||100

=9+1/100||100=100||100=50Ω.

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