Which reasons prohibit /reduce the probability of recombining of charge carriers in the base region of bi-polar junction transistor amplifier?

a. Increase in collector voltage increases the space charge width & decreases base width

b. Increase in emitter voltage increases the space charge width & decreases base width

c. Increase in emitter voltage decrease the space charge width & increases base width

d. Increase in collector voltage decreases the space charge width & increases base width

ANSWER: Increase in collector voltage increases the space charge width & decreases base width

Explanation:

Due to the phenomenon of early effect, the collector current increases slightly with voltage. This results in the reduction of base current.

However, increase in collector voltage also increases the space charge but reduces effective base-width. Therefore, there is less possibility for recombination within the base region.