A BJT will operate in an active region if _______.
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A.
an emitter base junction is reverse biased and a collector base junction is forward biased
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B.
an emitter base junction is forward biased and a collector base junction is forward biased
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C.
an emitter base junction is reverse biased and a collector base junction is reverse biased
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D.
an emitter base junction is forward biased and a collector base junction is reverse biased
Correct Answer:
D. an emitter base junction is forward biased and a collector base junction is reverse biased
Explanation:
A Bipolar Junction Transistor (BJT) operates in the active region when its two internal junctions are biased in opposite directions: the emitter-base junction must be forward-biased to allow charge carriers to flow into the base, while the collector-base junction must be reverse-biased to sweep those carriers into the collector. This specific biasing configuration enables the transistor to function effectively as an amplifier, where the collector current is directly proportional to the base current. In contrast, other regions like saturation involve both junctions being forward-biased, and cutoff involves both being reverse-biased.
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