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Q.

npn transistor conducts when the base

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a

both collector and emitter are positive with respect to

b

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

c

Collector  is  positive  and  emitter  is  at  the  same potential as the base

d

both collector and emitter are negative with respect to the base

answer is B.

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Detailed Solution

When the collector is positive and emitter is negative w.r.t  base,  it  causes  the  forward  biasing  for  each junction,  which causes conduction of current.

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A npn transistor conducts when the base