To calculate the charge that passes through a cross section of a wire carrying a steady current, you can use the formula:
Q = I * t
where Q is the charge, I is the current, and t is the time.
In this case, the current is given as 20 A and the time is given as 5 s. Plugging these values into the formula, we get:
Q = 20 A * 5 s Q = 100 Coulombs
Therefore, the charge that passes through the cross section of the wire in 5 seconds is 100 Coulombs.