Physics
Magnetic field lines about a current-carrying wire

Both of these
None of these
Circle the wire in closed loops
Extend radially from the wire

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Physics
In a bipolar junction transistor

The emitter has the least concentration of impurity
The base has the least concentration of impurity
The collector has the least concentration of impurity
All the three regions (the emitter, the base and the collector) have equal concentrations of impurity

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