Question

In a common base configuration Ie = 1 mA α = 0.95 the value of base current is

Options

• 1.95 mA

• 0.05 mA

• 1.05 mA

• 0.95 mA

Answer 1

0.05 mA

Explanation:

`alpha = I_c/I_e - (I_e - I_b)/I_e`

`I_b = I_e - alphaI_e`

= `Ie(1 - alpha)`

= `1 xx (1 - 0.05)`

= 0.05 mA.