Physics
In a bipolar junction transistor

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

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Physics
Super conductors are substances that

Offer high resistance to the flow of electric current
Conduct electricity at low temperature
Offer minimum resistance to flow of electric current
Conduct electricity at high temperature

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