Answer-A transistor works as an amplifier only when:

A transistor has three regions the emitter, the base, and the collector, forming two p-n junctions the emitter-base EB junction and the collector-base CB junction. The way these junctions are biased determines the operating region of the transistor. For a transistor to function as an amplifier, it needs to operate in the active region . In the active region The emitter-base junction is forward biased . This allows a large number of majority carriers from the emitter to flow into the base. The collector-base junction is reverse biased . This creates a potential barrier that attracts the minority carriers that have diffused through the base from the emitter towards the collector, resulting in a collector current that is controlled by the base current.