Assertion : In a common-emitter amplfier, the load resistnace of the output circuit is 1000 times the load resistance of the input circuit. If `alpha=0.98`, then voltage gain is `49xx10^(3)`.
Reason : `alpha=(beta)/(1-beta)` (symbols have their usual meanging).

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false.

Answer

C

Explanation

We know that
`alpha=(Deltai_(C))/(Deltai_(E)) and beta=(Deltai_(C))/(Deltai_(B))`
Also, `beta=(alpha)/(1-alpha)=(0.98)/(1-0.98)=49`
`therefore" Voltage gain "=beta=(R_(2))/(R_(1))=49xx100=49xx10^(3)`