Physics
The base of an electric iron is brightly polished mainly

To make it smooth and frictionless
To reduce heat loss by radiation
To make it rust-proof
To make it more durable

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Physics
In a bipolar junction transistor

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
The base has the least concentration of impurity

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