Question

A transistor having α = 0.8 is connected in common emitter configuration. When the base current changes by 6 mA, then the change in collector current is ______.

Options

• 12 mA

• 24 mA

• 0.66 mA

• 1.5 mA

Answer 1

A transistor having α = 0.8 is connected in common emitter configuration. When the base current changes by 6 mA, then the change in collector current is 24 mA.

Explanation:

Given, α = 0.8

Change In base current, Δl_b = 6 mA

For common emitter configuration,

`beta = alpha/(1 - alpha) = 0.8/(1 - 0.8)` = 4

Also, `beta = (Delta "l"_"c")/(Delta "l"_"b")`

`4 = (Delta "l"_"c")/(6 "mA")`

Δl_c = 24 mA