When an external magnetic field is applied to a material, these current loops tend to align in such a way as to oppose the applied field. This causes all materials to be repelled by a permanent magnet; however, the resulting force is usually too weak to be noticeable.
Sources of E. coli. E. coli O157:H7 is most commonly found in cows, although chickens, deer, sheep, and pigs have also been known to carry it. Meat becomes contaminated during slaughter, when infected animal intestines or feces come in contact with the carcass.
While E. coli is most often found in meat, it is not limited to it. The bacteria are also found in unpasteurized milk and apple cider, ham, turkey, chicken, roast beef, sandwich meats, raw vegetables, cheese and contaminated water.Bean and alfalfa sprouts have also been recalled because of E. coli contamination.. coli O157:H7, E. coli O104:H4 and other deadly strains belong to a family of bacteria that's evolved since the 1960s, when scientists believe E. coli and another bacteria, shigella, met and swapped genes.