In the output characteristics of a common-emitter configuration, a family of curves is obtained by varying VCE while keeping which quantity fixed? (Symbols have their usual meaning.)
IB
The question pertains to the output characteristics of a common-emitter (CE) transistor configuration in electronics. In analyzing these characteristics, it's essential to understand what parameters are varied and held constant.
The output characteristics of a common-emitter transistor involve plotting the collector current (\(I_C\)) against the collector-emitter voltage (\(V_{CE}\)) for different values of base current (\(I_B\)).
- Understanding Output Characteristics:
- The output characteristic curves show how the collector current varies with the collector-emitter voltage at different constant base currents.
- Fixed Parameter:
- In these plots, the base current (\(I_B\)) is held constant while \(V_{CE}\) is varied. This allows us to observe the effect of changing \(V_{CE}\) on \(I_C\).
- Ruling Out Other Options:
- \(I_C\): The collector current is not constant; it is what we observe varying in the output characteristic.
- \(V_{CE}\): This is the variable parameter in the graph; it changes while measuring output characteristics.
- \(V_{CC}\): This is the supply voltage; not directly a parameter in these characteristic curves.
- Conclusion:
- Therefore, to obtain the family of curves (output characteristics) for a common-emitter configuration, the base current (\(I_B\)) is kept constant while varying the collector-emitter voltage (\(V_{CE}\)).
Hence, the correct answer is IB.
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