A transistor is operated in common-emitter configuration at VC = 2V such that a change in the base current from 100 μ A to 200 μ A produces a change in the collector current from 5 mA to 10 mA. The current gain is (a) 100 (b) 150 (c) 50 (d) 75

Answer: (c). β = (Δ IC)/(Δ IB) Δ IC = 5 mA, Δ IB = 100 μ A = 0.1 mA β = 5/0.1 = 50 So the answer is (c) 50.

A transistor is operated in common-emitter configuration at VC = 2V… | NEET 2009 (AIPMT)

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Junction Transistor

A transistor is operated in common-emitter configuration at VC = 2V such that a change in the base current from 100 $\mu$ A to 200 $\mu$ A produces a change in the collector current from 5 mA to 10 mA. The current gain is

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Answer: (c)

$\beta = \frac{\Delta I_C}{\Delta I_B}$
$\Delta I_C = 5$ mA, $\Delta I_B = 100\,\mu$ A $= 0.1$ mA
$\beta = 5/0.1 = 50$
So the answer is (c) 50.

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