Two plates with area S = 300 cm2 each are located at a distance d = 2 cm from each other. The air between the plates is ionized by X-rays. At a voltage of U = 150 V, a current of strength I = 4 μA, far from saturation, flows between the plates. Determine the concentration of n ions of the same sign between the plates. The charge of each ion is considered equal to the elementary charge.
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