Physics
In a optical fibre cable, the signal is propagated along the

Surface and cladding
Both core and cladding
Inner Core
Cladding

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Physics
In a bipolar junction transistor

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