Given: t (time of passage of electrons through the cross section of the conductor) = 1 ms (1 * 10-3 s); n (the number of electrons that have passed through the conductor in a given time) = 3 * 10^8 electrons.
Reference data: e (charge of one electron) = 1.6 * 10^-19 Cl.
1) Determine the charge passed through the cross-section of the conductor: q = e * N = 3 * 10^8 * 1.6 * 10^-19 = 4.8 * 10^-11 Cl.
2) Calculate the current in the conductor: I = q / t = 4.8 * 10^-11 / (1 * 10^-3) = 4.8 * 10^-8 A (48 nA).
Answer: The current strength is 48 nA.
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