The ancient Greeks, originally those near the city of Magnesia, and overly the frontward of time Chinese knew about strange and r be stones (possibly chunks of bid ore strike by lightning) with the power to attract iron. A steel goad stroked with such a lodestone became magnetised as well, and or so 1000 the Chinese found that such a beset, when freely suspended, pointed north-south. The charismatic earn soon bedcover to Europe. Columbus utilise it when he crossed the Atlantic ocean, noting not only that the needle deviated slightly from exact north (as indicated by the stars) but also that the deviation changed during the voyage. Around 1600 William Gilbert, physician to ottoman Elizabeth I of England, proposed an commentary: the Earth itself was a giant magnet, with its magnetic poles some duration away from its geographic ones (i.e. near the points delineate the axis around which the Earth turns). The Earth is a long magnet, and its magnetic r egulate extends far into space. In our everyday environment, magnetic forces are of no importance and a sensitive instrument, the compass needle, is needed to receive them. That is because we, the materials we encounter in everyday life, so far the oxygen and normality which we breathe, are all electric automobileally neutral.
The atoms of oxygen, for instance, ingest electrons with interdict electric charges and protons which are positive, but the two charges correspondence each other(a)(a) andthe electric and magnetic forces jakescel. Magnetic forces have well-nigh no effect on neutral atoms. However, 60 miles (100 km) or to a grea! ter extent above the surface of the Earth, the essential environment is quite different. The fringes of the airwave at these heights are strongly heated by the Suns x-rays and ultra-violet light (and by other causes as well), causing negative electrons to be torn glowering atoms and leaving the remainder of the atoms as positively charged ions. These electrified fragments controvert strongly to the magnetic forces and can be...If you want to get a full essay, order it on our website: OrderCustomPaper.com
If you want to get a full essay, visit our page: write my paper