Question

The current gain `alpha` of a transistor is 0.95. The change in collector current corresponding to a change of 0.4 mA in the base current in a common emitter arrangement is ______.

Options

• 0.38 mA

• 2.375 mA

• 0.42 mA

• 7.6 mA

Answer 1

The current gain `alpha` of a transistor is 0.95. The change in collector current corresponding to a change of 0.4 mA in the base current in a common emitter arrangement is 7.6 mA.

Explanation:

`alpha = "Change in collector current"/"Change in emitter current"`

`therefore beta = alpha/(1-alpha) = 0.95/(1- 0.95` = 19

`therefore \triangle "I"_"C" beta (\triangle "I"_"B") = 19 xx 0.4 `= 7.6 mA