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A Triode is operating at E(c) = -4V, E(b...

A Triode is operating at `E_(c)` = -4V, `E_(b)` = 175 V and `l_(b)`=10mA. Around this operating point, the plate characteristics are linear and the parameters are `mu`=20, `r_(p)` = 8`Omega`. E is changed top `-6V`. To obtain the same plate current the value of `E_(b)` should be

A

40

B

135

C

191

D

215

Text Solution

Verified by Experts

The correct Answer is:
D
`mu = ((DeltaV_(p))/(DeltaV_(g)))_(l_(p))`
`DeltaV_(b) = 20 xx 2= 40`
`DeltaV_(b)= V_(b)^(') - V_(b) = 40`
`V_(b)^(') = 175 + 40 = 215`
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