A transistor is operated in common emitter configuration at VC = 2 V such that a change in the base current from 100 μ A to 300 μ A produces a change in the collector current from 10 mA to 20 mA. The current gain is (a) 50 (b) 75 (c) 100 (d) 25

Answer: (a). β = (Δ IC)/(Δ IB) Δ IC = 10 mA, Δ IB = 200 μ A = 0.2 mA β = 10/0.2 = 50 So the answer is (a) 50.

A transistor is operated in common emitter configuration at VC = 2 V… | NEET 2011 (AIPMT, Prelims)

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Junction Transistor

A transistor is operated in common emitter configuration at VC = 2 V such that a change in the base current from 100 $\mu$ A to 300 $\mu$ A produces a change in the collector current from 10 mA to 20 mA. The current gain is

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Answer: (a)

$\beta = \frac{\Delta I_C}{\Delta I_B}$
$\Delta I_C = 10$ mA, $\Delta I_B = 200\,\mu$ A $= 0.2$ mA
$\beta = 10/0.2 = 50$
So the answer is (a) 50.

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