A transistor is connected in common emitter mode. The collector supply is 10 volt and the voltage drop across resistor of `1 kOmega` in the collector circuit is 0.5 volt. If the current gain beta is 49, then

Options

A. the base current is `50 muA`
B. current gain `alpha` is `0.98`
C. the emitter current is about `510 muA`
D. the base current is `30 muA`

Answer

B, C

Explanation

Here, `V=0.5, R=1000Omega, V_(C)=0.5V, beta=49`
`I_(C)=V_C/R=0.5/1000=0.5 mA~~510 muA`
As, `beta=alpha/(1-alpha)`
So, `49=alpha/(1-alpha) or 49-49 alpha=alpha`
or `49=50alpha :. alpha=49/50=0.98`