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Question
Assertion :In the active state of the transistor the emitter base junction acts as a low resistance while base collector junction acts as a high resistance. Reason: In a transistor when emitter base junction is forward blased every small current enters this junction.
Assertion :In the active state of the transistor the emitter base junction acts as a low resistance while base collector junction acts as a high resistance. Reason: In a transistor when emitter base junction is forward blased every small current enters this junction.
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In transistors, the emitter base junction is called the input circuit with the emitter being heavily doped to inject large number of charge carriers into the base. Whereas, the base collector jucntion is called the output circuit with lightly doped base to pass most of the emitter injected carriers to the collector. The output circuit is reverse bias providing high resistance and the input circuit is forward bias providing low resistance.But the current paths are exactly opposite. Current flowing through the input circuit is forwad bias allowing more diffusing current to flow through it thereby decreasing the resistance. The output circuit which is reverse bias does not allow this diffusion current to flow pass properly. Thus, the decrease in current makes it act as a high resistance.
In transistors, the emitter base junction is called the input circuit with the emitter being heavily doped to inject large number of charge carriers into the base. Whereas, the base collector jucntion is called the output circuit with lightly doped base to pass most of the emitter injected carriers to the collector. The output circuit is reverse bias providing high resistance and the input circuit is forward bias providing low resistance.But the current paths are exactly opposite. Current flowing through the input circuit is forwad bias allowing more diffusing current to flow through it thereby decreasing the resistance. The output circuit which is reverse bias does not allow this diffusion current to flow pass properly. Thus, the decrease in current makes it act as a high resistance.
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