In a transistor circuit, when the base current is incréased by `50 muA` keeping the collector voltage fixed at 2 V, the collector current increase by 1 mA. The current gain of the transistor is

Options

A. 20
B. 40
C. 60
D. 80

Answer

A

Explanation

Given that,
In a transistor circuit,
Increase in base circuit, `Delta I_(b) = 50 muA`
Increase in collector current, `Delta I_(C) = 1 mA`
Collector voltage, `V_(C) = 2 V`
Current gain,
` beta = Delta I_(C)/Delta I_(b)`
`implies beta = Delta I_(C)/Delta I_(b) = 1 xx 10^(-3)/(50 xx 10^(-6)) = 1 xx 10^(3)/50 = 10^(3)/50`
`beta = 20`