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

1. I is proportional to V^(3/2)
2. I is proportional to V^(2/3)
3. I is proportional to V
4. I is proportional to V^(1/2)

Correct answer: I is proportional to V^(3/2)

Solution

In the space charge limited region of an electronic valve, the plate current (I) is proportional to the plate voltage (V) raised to the power of 3/2, as described by the Child-Langmuir law.

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