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.
Many kinds of E. coli bacteria normally are found in human intestines * (and the vagina in women), but sometimes they are able to make their way into the urethra. When this happens, the bacteria can spread up into other parts of the urinary tract and cause an infection.