Лаг1989 задача №15.49

The air enclosed between plates of area S = 300 cm², located at a distance d = 2 cm from each other, is ionized by X-rays. At a voltage
U = 150 V, much smaller than the voltage giving the saturation current, between the plates there is a current I = 4 μA. Find the concentration of n ions between the plates.

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