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An npn transistor operates as a common emitter amplifier, with a power gain of 60 dB. The input circuit resistance is 100 Ω and the output load resistance is 10 k Ω . The common emitter current gain β is .

1. 10 2
2. 10 4
3. 60
4. 6 × 10 2

Correct answer: 10 2

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