A line can be without load but can still be carrying how much charge?

A line can be without load but still carry a certain amount of charge due to the presence of electrical fields in the conductors. In electrical systems, it is possible for a line to have a specific amount of current flowing through it even when there isn’t a load connected, due to various factors such as stray capacitance or induced currents.

In this scenario, the correct choice of 20 amps reflects a plausible current level that can exist in a line without a load, typically related to maintenance or test scenarios where a certain amount of current is tested or measured. The current doesn't contribute to any useful work because there’s no load consuming it but indicates that the electrical potential is still present in the line.

The other values given could represent current levels that might not practically align with typical scenarios where a line would be "without load." This may lead to confusion, as those values are either too high for lines without a significant load or don't represent usual scenarios in practical applications of electrical lines. In an actual electrical system, the amount of current a line can carry without a load can vary based on design and safety factors, but 20 amps serves as a reasonable reference point.