Why it is advise to clean the ends of connecting wires before connecting them?

How would a small bar magnet be oriented when placed at position x?

Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 g. is this value cause for worry?

According to the image below, which season is about to begin in the southern hemisphere? a. summer b. autumn c. winter d. spring