The current gain -may be defined as

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Question

The current gain $β$ -may be defined as

the ratio of change in collector current to the change in emitter current for a constant collector voltage in a common base arrangement

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the ratio of change in collector current to the change in base current at constant collector voltage in a common emitter circuit

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the ratio of change in emitter current to the change in base current for constant emitter voltage in common emitter circuit

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the ratio of change in base current to the change in collector current in constant collector voltage in common emitter circuit

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Solution

The correct option is B the ratio of change in collector current to the change in base current at constant collector voltage in a common emitter circuit
By definition, current gain $β$ is defined as the ratio of change in collector current to change in base current for a constant collector voltage in a common emitter circuit.
$β = \frac{Δ i_{C}}{Δ i_{B}}$ or simply $β = \frac{I_{C}}{I_{B}}$
Generally, $β$ has value between $20$ and $200.$

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The current gain β-may be defined as

The current gain $β$ -may be defined as