Physics
A small piece of a substance is weakly attracted by a strong magnetic field. The substance is

Non-magnetic
Paramagnetic
Ferromagnetic
Diamagnetic

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

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