[单选题]
A vertical wire carries a current strai: opz3e5; vpfe(uyp,ov7g:md)b 5o8xzrby1wght up in a region wherep2l5dges.z1qk ,zl yj9(od m+ the magnetic field vectdk92yqjd 1l5(zml+pg ,o esz. or points due north. What is the direction of the resulting force on this current?
