Nitrogen between flat electrodes of the ionization chamber is ionized by X-rays. The strength of the current flowing through the chamber 1.5 microamps. The area of each electrode 200 cm ^ 2, the distance between them of 1.5 cm, a potential difference of 150 V. Determine the concentration of ions between the plates when the current further from saturation. The charge of each ion is equal to the elementary charge.

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