Physics
In a bipolar junction transistor

The collector 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 base has the least concentration of impurity

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Physics
A dynamo is a device which

Creates electrical energy
Converts electrical energy into mechanical energy
Converts mechanical energy into electrical energy
Creates mechanical energy

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