In a common emitter transistor amplifier circuit, the current gain α = 0.8. If the base current changes by 3 then the collector current changes by (a) 4 (b) 12 (c) 6 (d) 24

Answer: (b). β = (α)/(1 - α) = (0.8)/(0.2) = 4 Δ IC = β Δ IB = 4 × 3 = 12 μ A So the answer is (b) 12 μ A.

In a common emitter transistor amplifier circuit, the current gain α… | MHT CET 2025 (23 Apr, Shift 1)

Q20MHT CET 2025 · 23 APR · SHIFT 1Easy

Junction Transistor

In a common emitter transistor amplifier circuit, the current gain $\alpha = 0.8$ . If the base current changes by $3\,\mu\text{A}$ then the collector current changes by

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Answer: (b)

$\beta = \dfrac{\alpha}{1 - \alpha} = \dfrac{0.8}{0.2} = 4$
$\Delta I_C = \beta\,\Delta I_B = 4 \times 3 = 12\,\mu$ A
So the answer is (b) $12\,\mu$ A.

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