Final answer:
In fog or mist, high beam headlights should not be used as they cause light to reflect back, reducing visibility. Low beams minimize reflection and glare. Headlights would not dim with superconducting wires aside from the battery's internal resistance.
Step-by-step explanation:
When driving in fog or mist, it is advised to never use your headlights on the high beam setting. This is because the high beams direct light straight ahead at a higher angle, which can reflect off the water droplets in the fog back into your eyes, effectively reducing visibility. The low beam setting directs light downwards, minimizing reflection and glare, and improving your ability to see the road. If the wires in your automobile were superconductors, your headlights would not dim when starting your car's engine as superconductors have no electrical resistance and can carry a current indefinitely without any energy loss outside of the battery's own internal resistance.