1.

For a transistor beta=45, the change in the voltage across 5kOmega resistor which is connected in collector circuit is 5 V. Find the change in base current.

Answer»

Solution :`BETA=((DeltaI_(C))/(DeltaI_(B)))_(V_(CE))`
(If only d.c. values are considered)
`THEREFORE I_(C)=betaI_(B)=40xx25xx10^(-6)=1000xx10^(-6)A`
`therefore I_(E)=I_(B)+I_(C)=(25xx10^(-6)+1000xx10^(-6))" AMP"`
`=1025muA=1.025mA`


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