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What is the plate current in a diode val...

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.

A

30 mA

B

20 mA

C

40 mA

D

10 mA

Text Solution

Verified by Experts

The correct Answer is:
C
Using Child Langmuir law, `lpropt(60)^(3//3)`
`320 prop(24)^(3//2)`...........(ii)
Dividing Eq. (i) by Eq. (ii), we get
`(320)/l = (4)^(3//2) rArr l=(320)/8 rArr l=40 mA`
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