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An NPN transistor is used in common emitter configuration as an amplifier with 1 k Ω load resistance. Signal voltage of 10 mV is applied across the base-emitter. The produces a 3 mA change in the collector current and 15 μ A change in the base current of the amplifier. The input resistance and voltage gain are –

1. 0.67 k Ω , 300
2. 0.67 k Ω , 200
3. 0.33 k Ω , 1.5
4. 0.33 k Ω , 300

Correct answer: 0.67 k Ω , 300

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