Physics
Magnetism in materials is due to

Protons at rest
All neutrons at rest
Electrons at rest
Circular motion of electrons

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Physics
In a bipolar junction transistor

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

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