Physics
Superconductors are those elements

Whose resistance falls almost to zero at very low temperatures
Which turn into insulators at very low temperatures
Which conduct electricity only at super-high temperatures
Whose conductivity is intermediate between metals and insulators

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Physics
In a bipolar junction transistor

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

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