A transistor is operated in common emitter configuration at constant collector voltage VC = 1.5 V such that a change in the base current from 100 μ A to 150 μ A produces a change in the collector current from 5 mA to 10 mA. The current gain β is (a) 50 (b) 67 (c) 75 (d) 100

Answer: (d). β = (Δ IC)/(Δ IB) Δ IC = 5 mA, Δ IB = 50 μ A = 0.05 mA β = 5/0.05 = 100 So the answer is (d) 100.

A transistor is operated in common emitter configuration at constant… | NEET 2006 (AIPMT)

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Junction Transistor

A transistor is operated in common emitter configuration at constant collector voltage VC = 1.5 V such that a change in the base current from 100 $\mu$ A to 150 $\mu$ A produces a change in the collector current from 5 mA to 10 mA. The current gain $\beta$ is

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Answer: (d)

$\beta = \frac{\Delta I_C}{\Delta I_B}$
$\Delta I_C = 5$ mA, $\Delta I_B = 50\,\mu$ A $= 0.05$ mA
$\beta = 5/0.05 = 100$
So the answer is (d) 100.

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