Question

In a silicon transistor, a change of 7.89 mA in the emitter current if produces a change of 7.8 mA in the collector current, then the base current must change by ____________.

Options

• 0.9 µA

• 900 µA

• 90 µA

• 9 µA

Answer 1

In a silicon transistor, a change of 7.89 mA in the emitter current if produces a change of 7.8 mA in the collector current, then the base current must change by 90 µA.

Explanation:

`Delta "I"_"B" = Delta "I"_"E" - Delta "I"_"C"`

` = (7.89 - 7.8)  "mA"`

`= 0.09  "mA"`

`= 9 xx 10^-2 "mA"`

`= 9 xx 10^-2 xx 10^3 mu  "A"`

`= 90  mu "A"`