Since the electric power has been of chief significance to living, humans have engaged themselves into conception of possibilities to obtain higher potentials and benefits with electric and magnetic fields given constant exposure to them. Scientists have long understood even during the 19th century that there exists special connection between electrical fields and magnetic fields which may be experienced everywhere on earth. Moving electric charge (electric current) can induce magnetic field. As such, coils of wire can serve as large electromagnets used in car junk yards in the same way that electric motors can be used to start a car engine or spin a computer’s hard disk. This phenomenon explicates as well how ordinary magnets are derived from tiny currents at the atomic level.An electrical current or electric field is formed by an altering magnetic field which creates electromagnetic waves in the process. Power generator manufacturers utilize this principle to have large coils of wire bear the expected capacity of yielding magnetic field whether by falling water, wind, or steam by burning coal or oil, and even by through the heat coming from nuclear reactions whenever feasible. Audio and video tapes and compact disks, similarly, are capable of encoding information in magnetic patterns whereby magnetic directions and magnetic strengths are alternating. When a magnetic disk or tape material happens to pass near wire coils of any size, electrical currents or fields are generated. Because magnetic fields are regions where an object exhibits magnetic influence, the same object acquires the potential to attract or repel a neighboring magnetic body along the magnetic field lines. It must be noted, however, that magnetic forces have nothing to do with gravity and the amount of gravity depends upon an objects mass whereas magnetic strength is a function of the matter’s composition.Placing an object in a magnetic field, thus, imply locating its magnetic impact along field lines and this is the reason students dealing with a number of experiments in physics witness small iron pieces gather around magnets along unseen field line paths. Magnetic poles pertain to points where magnetic field lines begin and end or that field lines are said to converge to or diverge from them. Same idea applies to the Earth’s north and south poles which work just as how the ends of an ordinary magnet
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