In a forward-biased BJT base-emitter junction, holes are injected from the base into the emitter, where they_______?
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Answer: D. Only (a) and (b)
Explanation
Forward biasing the base-emitter junction injects minority carriers that traverse the thin base region. A portion of these injected carriers recombines in the base, establishing a net base current component. Remaining injected carriers reach the collector region, directly contributing to the main collector current. Bipolar junction transistors operate through the injection and collection of minority charge carriers. The base region is intentionally kept very thin to maximize carrier transport efficiency. Current gain in a BJT depends heavily on minimizing base recombination losses.
Understanding carrier dynamics is essential for designing high-speed switching and amplifying circuits. Transistor modeling relies on precise mathematical equations describing minority carrier distributions. Power BJTs utilize these physical principles for high-current amplification tasks. Claiming injected holes do not contribute to collector current ignores standard BJT transport physics. Stating only that it results in base current ignores the concurrent contribution to collector current. Options a and b together are incomplete because injected holes definitely reach the collector.
- Subject
- Engineering
- Category
- Electrical Engineering
- Topic
- —
- Difficulty
- medium
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