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Passage I An n-p-n transistor is used ...

Passage I
An n-p-n transistor is used as a voltage amplifier in a commoin emitter circuit given
`V_(CC)=8V I_(C )=4mA`
`V_(CE)=4V,`
`(V_(BE)=0.6 V, V_(BB)=8V`
`beta_(Dc)=200`
The value of base resistance is

A

185 k `omega`

B

275 k `omega`

C

370 k `omega`

D

410 k `omega`

Text Solution

Verified by Experts

Given `beta_(ac) = (I_(c ))/( I_(B)) = 200`
`I_(B) = (I_(c ))/( beta_(ac)) = (4mA)/( 200) =(4xx 10^(-3))/( 200) = 2xx 10^(-5) A`
`rArr R_(B) = (V_(BB) - V_(BE))/( I_(B)) = (8-0.6)/( 2 xx 10^(-5)) = 3.7 xx 10^(5) Sigma `
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