A transistor works as an amplifier when
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- Emitter-base junction is forward biased and base-collector junction is reverse biased
- Both emitter-base and base-collector junctions are forward biased
- Both emitter-base and base-collector junctions are reverse biased
- Emitter-base junction is reverse biased and base-collector junction is forward biased
The Correct Option is A
Solution and Explanation
- In this region, the emitter-base junction is forward biased to allow current injection of charge carriers from emitter to base.
- The base-collector junction is reverse biased so that the charge carriers injected into the base are swept into the collector, resulting in current amplification.
- Other biasing configurations result in cutoff or saturation, not amplification.
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