An NPN transistor is used in common emitter configuration as an amplifier with 1 kΩ load resistance.

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asked Sep 12 in Science by navnit40 (-4,766 points)

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

 (1)  0.67 kΩ, 300

(2)  0.67 kΩ, 200

(3)  0.33 kΩ, 1.5 

(4)  0.33 kΩ, 300

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answered Sep 12 by muskan15 (-3,447 points)

Correct option (1)  0.67 kΩ, 300

 Explanation:

Current input = 15 × 10-6

Current output = 3 × 10-3

R0 = 1000

Vin = 10 × 10-3

Vin = rin × Iin

rin = 2000/3 = .67kΩ

Voltage gain = V0/Vi = (1000 × 3 × 10-3)/(10 × 10-3) = 300

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