An npn transistor conducts when (a) both collector and emitter are positive with repect to the base. (b) collector is positive and emitter is negative with respect to the base. (c) collector is positive and emitter is at same potential as the base. (d) both collector and emitter are negative with respect to the base.

An npn transistor conducts when collector is positive and emitter is negative with respect to the base because emitter base junction is forward bias and collector base junction is reverse bias. Hence, the correct answer is (b)

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