For an electronic valve, the plate current I and plate voltage

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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 V²

Correct Option: A

According to Child’s Law,
I_a = KV_a^3/2
Thus, I ∝ V^3/2