Physics
In a bipolar junction transistor

The emitter has the least concentration of impurity
The base 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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Physics
Air moves from the region where the air ________

Humidity is low to the region where the humidity is high
Pressure is high to the region where the pressure is low
Humidity is high to the region where the humidity is low
Pressure is low to the region where the pressure is high

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