In a transistor amplifier,the base-emitter junction is forward-biased and the collector-emitter junction is reverse-biased. The current gain is defined as:
- A$\frac{\Delta I_{E}}{\Delta I_{B}}$
- B$\frac{\Delta I_{B}}{\Delta I_{E}}$
- C$\frac{\Delta I_{B}}{\Delta I_{C}}$
- D$\frac{\Delta I_{C}}{\Delta I_{B}}$
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