Physics
A good conductor while carrying current is

Positively charged
Electrically neutral
Negatively charged
Alternately charged positive and negative

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Physics
In a bipolar junction transistor

All the three regions (the emitter, the base and the collector) have equal concentrations of impurity
The collector has the least concentration of impurity
The emitter has the least concentration of impurity
The base has the least concentration of impurity

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