Question

Which of the following is true for the cut-off region in an npn transistor?

(a) Potential difference between the emitter and the base is smaller than 0.5V

(b) Potential difference between the emitter and the base is smaller than 0.4V

(c) The collector current increases with the increase in the base current

(d) The collector current is always zero and the base current is always non zero

This question was addressed to me by my college professor while I was bunking the class.

I'd like to ask this question from BJT Circuits at DC topic in chapter Bipolar Junction Triodes (BJTs) of Electronic Devices & Circuits

Answer 1

Right option is (b) Potential difference between the emitter and the base is smaller than 0.4V

To explain I would say: Both collector and emitter current are zero in cut-off region.