An electron with a speed vo flies out from the cathode of a lamp made in the form of a flat capacitor. The anode potential at regular intervals T changes sign to the opposite, remaining constant inside the gap and equal to ± V. If the charge e, the mass m of the electron and the distance L between the electrodes are considered known, then in what time t will the electron reach the anode? It is known that T<<t and at the first time interval the anode potential is positive.

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