(a) The power lines outside generally carry an \"alternating current\" (AC) that switches its direction many times per second. However, for some special1 extra high voltage power lines it is advantageous to run a \"direct current\" (DC) of the type we have been discussing in class. Consider such a power line carrying a direct current of 400 A and calculate what the magnetic eld strength would be if you stand directly.' under the cable 10 n1 beneath it. (h) Describe the direction of the magnetic eld relative to you if you are standing right underneath the cable such that your nose is pointing in the same direction as the current. ((2) Bonus question {not for credit}: How does the magnetic eld strength computed in part (3} compare to the strength of the Earth's magnetic eld in Misstsseuga