Question

In a pnp-BJT, when the E-B junction is forward biased and no voltage is applied across C-B junction, what happens to the width of the depletion region in the E-B junction?

(a) Increases

(b) Decreases

(c) Remains same

(d) Can’t be determined

The question was asked during an interview for a job.

The origin of the question is BJT Construction and Operation in portion BJT Biasing of Analog Circuits

Answer 1

Right option is (b) Decreases

To elaborate: On application of a forward bias voltage across E-B junction, the width of the depletion region decreases.