An n-p-n transistor conducts when

both collector and emitter are positive with respect to the base

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collector is positive and emitter is negative with respect to the
base

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collector is positive and emitter is at same potential as the base:

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both collector and emitter are negative with respect to the base.

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Solution

The correct option is B collector is positive and emitter is negative with respect to the
base
An $n - p - n$ transistor conducts when collector is positive and emitter is negative with respect to the base since emitter base junction is forward bias and collector base junction is reverse bias.

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n-p-n transistor has three leads A, B and C.
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Q. An incomplete sentence about transistors is given below:
The emitter−..... junction is __ and the collector−..... junction is __. The appropriate words for the dotted empty positions are, respectively,
(a) 'collector' and 'base'
(b) 'base' and 'emitter'
(c) 'collector' and 'emitter'
(d) 'base' and 'base'.

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[