The ac current gain of a transistor is 120. What is the change in the collector current in the transistor whose base current changes by 100 μ A?

Question

The ac current gain of a transistor is 120. What is the change in the collector current in the transistor whose base current changes by 100 μ A? (A) 6 mA (B) 12 mA (C) 3 mA (D) 24 mA

Tardigrade Admin · Accepted Answer

Here, IB = 100 μ A = 100 × 10-6 A, βac = 120 Using, βac = (Δ IC/Δ IB) ∴ 120 = (Δ IC/100 × 10-6) Change in collector current, Δ IC = 120 × 100 × 10-6 = 12× 10-3 = 12 mA

Q. The $a c$ current gain of a transistor is $120$ . What is the change in the collector current in the transistor whose base current changes by $100 μ A$ ?

$6 m A$

$12 m A$

$3 m A$

$24 m A$

Here, $I_{B} = 100 μ A$
$= 100 \times 1 0^{- 6} A, β_{a c} = 120$
Using, $β_{a c} = \frac{Δ I _{C}}{Δ I _{B}}$
$∴ 120 = \frac{Δ I _{C}}{100 \times 1 0 ^{- 6}}$
Change in collector current,
$Δ I_{C} = 120 \times 100 \times 1 0^{- 6}$
$= 12 \times 1 0^{- 3}$
$= 12 m A$

Q. The ac current gain of a transistor is 120. What is the change in the collector current in the transistor whose base current changes by 100μA?

6mA

12mA

3mA

24mA