Home
Class 12
PHYSICS
In a diode vaccum tube, the plate curren...

In a diode vaccum tube, the plate currentis 5 mA, when the plate voltage is 160 V, a grid is introduced between the plate and cathode and a voltage of -2V is applied to it. The plate current will becomes
(if `g_(m) = 5 xx 10^(-3)Omega^(-1)`

A

20 mA

B

10 mA

C

4 mA

D

7.5 mA

Text Solution

Verified by Experts

The correct Answer is:
C
`V_(g_(1))=0`
`l_(p)` = plate current =5mA
`V_(p)` = plate voltage =150 mV
`V_(g)` = grid voltage=`-2V`
When `V_(g)` = 0, it is a diode
When `V_(g)=-2`, It is a triode
`therefore g_(m) = ((Deltal_(p))/(DeltaV_(g)))_(V_(p)="constant")`
`5 xx 10^(-4) = (l_(2)-l_(1))/(V_(2)-V_(1))(l_(2)-5 xx 10^(-3))/(-2-0)`
`-10 xx 10^(-4) + 5 xx 10^(-3) = l_(2)`
`-1 xx 10^(-3) + 5 xx 10^(-3) = l_(2)`
`l_(2)=4mA`
Promotional Banner

Topper's Solved these Questions

  • SEMICONDUCTOR DEVICES AND LOGIC GATES

    BITSAT GUIDE|Exercise BITSAT Archives|5 Videos

  • RAY OPTICS

    BITSAT GUIDE|Exercise All Questions|39 Videos

  • SOLVED PAPER 2017

    BITSAT GUIDE|Exercise (PART -I) PHYSICS |40 Videos

Similar Questions

Explore conceptually related problems

The plate current in a diode is 20 mA when the plate voltage is 50 V or 60 V . What will be the current if the plate voltage is 70 V ?

In a vaccume diode, when the plate voltage is 40 V, the plate current is 10 mA. For a plate voltage of 160 V, the plate current is

For an electronic valve, the plate current I and plate voltage V in the space charge limited region are related as

In space charge limited region, the plate current in a diode is 10 mA for plate voltage 150 V . If the plate voltage is increased to 600 V , then the plate current will be

The power delivered in the plate circuit of a diode is 1.0 W when the plate voltage is 36 V . Find the power delivered if the plate voltage is increased to 49 V . Assume Langmuir-Child equation to hold .

When the plate voltage of a triode is 150 V, its cut-ff voltage is -5V . On increasing the plate voltate to 200V, the cut-off voltage can be

At a plate potential of 150 V the palte current in a diode is 8 mA under space charge limited conditions if the plate potential is changed to 300 V the plate current is

What is the plate current in a diode valve under the space charge limited operation, when the plate potential is 60 V? In a diode valve, the plate current is 320 mA, then the plate potential is 240 V.