Home
Class 12
PHYSICS
The current gain for a transistor workin...

The current gain for a transistor working as a common-base amplifier is `0.96`. If the emitter current is `7.2 mA`, the base current will be

A

`0.42 mA`

B

`0.49 mA`

C

`0.35 mA`

D

`0.29 mA`

Text Solution

Verified by Experts

The correct Answer is:
D
Current gain of transistor is
`alpha=(DeltaI_(C))/(Deltai_(E))`
Where `Deltai_(C)` is change in collector current, and `Deltai_(E)` is change in emitter current.
Given, `alpha=0.96,Deltai_(E)=7.2`,
`Deltai_(C)=0.96xx7.2=6.91 mA`
Also `Deltai_(E)=Deltai_(C)+Deltai_(B)`
`:. Deltai_(B)=Deltai_(E)+Deltai_(C)=7.2-6.91=0.29 mA`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • SEMICONDUCTOR ELECTRONICS

    A2Z|Exercise Assertion Reason|18 Videos

  • SEMICONDUCTOR ELECTRONICS

    A2Z|Exercise SECTION -D|1 Videos

  • SEMICONDUCTOR ELECTRONICS

    A2Z|Exercise AIPMT/NEET Questions|77 Videos

  • NUCLEAR PHYSICS

    A2Z|Exercise Section D - Chapter End Test|29 Videos

  • SOURCE AND EFFECT OF MAGNETIC FIELD

    A2Z|Exercise Section D - Chapter End Test|30 Videos

Similar Questions

Explore conceptually related problems

In an NPN transistor working as a common base amplifier, current gain is 0.96 and emitter current isb7.2mA .The base current is

In a PNP transistor working as common-base amplifier, current gain is 0.96 and current is 7.2 mA . The base current is

Knowledge Check

  • The current gain for transistor working as a common base amplifier is 0.96.If the emitter current is 7.2mA, then the base current is

    A
    0.29mA
    B
    0.35mA
    C
    0.39mA
    D
    0.43mA

  • The current gain for transistor working as common base amplifier is 0.96. If the emitter current is 7.2 mA, then the base current is

    A
    0.29
    B
    0.35 mA
    C
    0.39 mA
    D
    0.43 mA

  • The current gain for transistor working as a common base amplifier is 0.96 .If the emitter current is 7.2mA , then the base current is, In Question 26, for V_CE=0 the above graph lines will be

    A
    Straight along `I_(B)`
    B
    straight along `V_(BE)`
    C
    Straight lines at `45^(@)` with `V_(BE)`
    D
    curve as above

    • Similar Questions

    Explore conceptually related problems

    The current gain for a common emitter amplifier is 69. If the emitter current is 7 mA, the base current is

    For a CE amplifier, the current gain is 69. If the emitter current is 7 mA, then the base current will be,

    The current gain of a transistor in common emitter configuration is 80. If the emitter current be 8.1 mA , then the collector current will be

    For a transistor working as common base amplifier, the emitter current is 0.72 mA. The. Current gain is 0.96. The collector current is

    For a common emitter amplifier, current gain is 70 . If the emitter current is 8.4 mA , then the base current is

    Home
    Profile