5. For an electronic valve, the plate current I and plate voltage V in the space charge limited region are related as ?
(a) \( I \text{ is proportional to } V^{3/2} \)
(b) \( I \text{ is proportional to } V^{2/3} \)
(c) \( I \text{ is proportional to } V \)
(d) \( I \text{ is proportional to } V^{2} \)
Answer : (a) \( I \text{ is proportional to } V^{3/2} \)
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