Question

In a transistor, a change of 8.0 mA in the emitter current produces a change of 7.8 mA in the collector current. What change in the base current is necessary to produce the same change in the collector current.

• A. 50 μA
• B. 100 μA
• C. 150 μA
• D. 200 μA

Answer 1

Answer: (D)

200 μA

Answer 2

$\Delta i_{e} = \Delta i_{c} + \Delta i_{b}$

⇒ 8 = 7.8 +$\Delta i_{b} \Rightarrow \Delta i_{b}$=0.2mA = 200 μA.