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The current gain of a transistor in common emitter configuration is 70. If emitter is 8.8 mA, then find (i) base current (ii) collector current. (iii) the current gain in common base configuration. |
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Answer» Solution :`"Current gain, "beta=(I_(C ))/(I_(B)), I_(E)=I_(B)+I_(C )` (i) `I_(C )=betaI_(B)"or"I_(C )=70I_(B)` `"Since "I_(E)=I_(B)+I_(C )"or"I_(E)=I_(B)+70I_(B)` `orI_(E)=71I_(B)` `therefore I_(B)=(I_(E))/(71)=(8.8)/(71)=0.124mA` (ii) Collector current `=I_(C)` `I_(C )=70I_(B) or I_(C )=70xx0.124=8.68mA` (III) Current gain in common BASE configuration `ALPHA=(beta)/(1+beta) or alpha=(70)/(71)=0.986` |
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