Physics
The rotational effect of a force on a body about an axis of rotation is described in terms of

Moment of force
Centripetal force
Centrifugal force
Centre of gravity

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

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