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In a transistor emitter-base junction is...

In a transistor emitter-base junction is always forward biased while the collector-base junction is reverse biased. Why ?

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This bias system is the condition of the transistor to be active. As the emitter-base is forward biased the input resistance i.e the resistance of the emitter -base junction becomes very small. Again as the collector base junction is reverse biased the output resistance i.e the resistance of the emitter -collector becomes very high. The circuit with low input resistance and high output resistance acts as the best amplifier.
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