Determine the amount of charge passing through the cross-section of the conductor.

Determine the amount of charge passing through the cross-section of the conductor. Distance = 4 mm ^ 2 in 3 minutes, if the current density is 100 A / cm ^ 2.

Initial data: S (cross-sectional area of the conductor) = 4 mm2 (4 * 10-2 cm2); t (duration of the passage of the charge) = 3 min (180 s); j (current density) = 100 A / cm2.

We calculate the amount of charge from the formula for calculating the current density: j = q / (S * t), whence q = j * S * t.

Let’s make a calculation: q = 100 * 4 * 10-2 * 180 = 720 Cl.

Answer: A charge of 720 C will pass through the cross-section of the conductor.