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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)`=10 mA. Around this operating point, the plate characteristics are linear and the parameter values are `mu`=20, `g_(m)`=2.5 mA/V.
If `E_(c)` is changed to `-6`V with `E_(b)` = 175 V, the value of `l_(b)` is given by

A

10 mA

B

20 mA

C

15 mA

D

5 mA

Text Solution

Verified by Experts

The correct Answer is:
D
`E_(01) = -4V`, `l_(b) = 10mA`, `E_(b) = 175V`, `mu=20`
`g_(m) = 25 mA//V`
`E_(c_(2))` = -6V, `E_(b) = 175`V
At constant plate potential 175 V
`g_(m) = (Deltal_(b))/(Deltal_(c))_(V_(b))`
`2.5 xx 10^(-3) = (Deltal_(b))/(-4+6)`
`l_(b)-l_(b)^(') = 5mA`
`l_(b)^(') = 10-5 5 mA`
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