How long does it take for a charge of 30 C to pass through the cross-section of the conductor, at a current of 200mA?

Initial data: q (the amount of charge that will pass through the cross section of the conductor) = 30 C, I (current in the conductor) = 200 mA = 0.2 A.

The time of passage of the charge through the conductor is determined from the formula for calculating the current strength: I = q / t, whence t = q / I.

Let’s perform the calculation: t = 30 / 0.2 = 150 s or 2 min 30 s.

Answer: A charge of 30 C will pass through the cross-section of the conductor in 2 minutes 30 seconds.