In a transistor amplifier, the base-emitter junction is forward-biased and the collector-base junction is reverse-biased. The current gain $(\beta)$ is defined as:
- A$\Delta I_C / \Delta I_B$
- B$\Delta I_B / \Delta I_C$
- C$\Delta I_C / \Delta I_E$
- D$\Delta I_B / \Delta I_E$
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