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Question: The ac current gain of transistor is 120. What is the change in the collector current in the transis...

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

A

6 mA

B

12 mA

C

3 mA

D

24 mA

Answer

12 mA

Explanation

Solution

: here, IB=100μA=100×10−6A,βac=120I_{B} = 100\mu A = 100 \times 10^{- 6}A,\beta_{ac} = 120

Using, βac=ΔICΔIB∴120=ΔIC100×10−6\beta_{ac} = \frac{\Delta I_{C}}{\Delta I_{B}}\therefore 120 = \frac{\Delta I_{C}}{100 \times 10^{- 6}}

Changes in collector current

ΔIC=120×100×10−6=12×10−3=12mA\Delta I_{C} = 120 \times 100 \times 10^{- 6} = 12 \times 10^{- 3} = 12mA