Question: Two large parallel plates are located in vacuum. One of them serves as a cathode, a source of electrons whose initial velocity is negligible. An

Two large parallel plates are located in vacuum. One of them serves as a cathode, a source of electrons whose initial velocity is negligible. An electron flow directed toward the opposite plate prod aces a space charge causing the potential in the gap between the plates to vary as φ = ax4/3, where a is a positive constant, and x is the distance from the cathode. Find:

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