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An n-p-n transistor conducts when

1. both collector and emitter are negative with respect to the base
2. both collector and emitter are positive with respect to the base
3. collector is positive and emitter is negative with respect to the base
4. collector is positive and emitter is at same potential as the base

Correct answer: collector is positive and emitter is negative with respect to the base

Solution

An n-p-n transistor conducts when the collector is positive and the emitter is negative with respect to the base, as this ensures proper forward biasing of the base-emitter junction and reverse biasing of the base-collector junction.

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