Question

In the study of transistor as an amplifier, the ratio of collector current to emitter current is 0.98 then the ratio of collector current to base current will be ______.

Options

• 99

• 49

• 50

• 98

Answer 1

In the study of transistor as an amplifier, the ratio of collector current to emitter current is 0.98 then the ratio of collector current to base current will be 49.

Explanation:

The ratio of collector current to emitter current at constant collector-base voltage is the current the amplification factor and given by

`alpha = "l"_"C"/"l"_"E"` = 0.98     (given)

The ratio of collector current to the base current at constant collector-emitter voltage is given by

`beta = "l"_"C"/"l"_"B"`

These are related as `beta = alpha/("T" - alpha)`

`=> beta = 0.98/(1 - 0.98) = 0.98/0.02` = 49