Physics
. . . . . . . . . exerts a force on anything that has an electric charge.

All of these
Inductive field
Electrostatic force
Electric field

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Physics
In a bipolar junction transistor

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 emitter has the least concentration of impurity
The collector has the least concentration of impurity

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