Electric and Magnetic Fields Essay Example | Topics and Well Written Essays - 1000 words

Electric and Magnetic Fields - Essay Example Electrical charges and magnets are found to exert forces upon distant objects, thereby altering the region of space surrounding them. The altered space becomes the force field  eventually and through this effect, the body is able to respond to its local environment enabling distant objects to react across space by the nature of the forces caused by the fields. A magnet or an electric charge responds to the field made by the objects immediately within its reach. Equivalently, a massive object can establish a  field of gravity upon which distant entities manage a certain degree of exertion. Though magnetic fields  function hand in hand with electric fields, specific properties distinguish one from the other. The notion of field lines and magnetic fields in existence was initially studied by the English scientist Michael Faraday  (1791-1867) then further by  James Clerk Maxwell (1831-1879), both of whom pioneered remarkable discoveries of electromagnetism in several aspects.  Maxwell proposed that ‘if a changing magnetic field can make an electric field, then a changing electric field, as via an oscillating electric charge for instance, should make a magnetic field’. Under these circumstances, the changing electric and magnetic fields would activate each other and move at a speed approaching the speed of light. Base on such grounds with empirical findings, Maxwell came up with the theory that light  is  an electromagnetic wave which was given proof by the experiments conducted after his time. Figure 1 - Electric Field (Red) and Magnetic Field (Blue) 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 object's mass whereas magnetic strength is a function

Environmental Values Essay Example | Topics and Well Written Essays - 1000 words

Environmental Values - Essay Example in 1974 drew inspiration from the feminist movements in which feminist activists rebelled against the traditional oppression of women by domineering men. In many countries, even developed countries, women are the weaker gender and without voice and are forced to accept the exploitation by men. Ecofeminism attempts to relate these events to the fact that nature and environment is exploited by men in the same way and nature attempts to meekly accept this racism, species segregation and exploitation. To a certain extent the main complaints and philosophy of the movement is indeed true and the arguments put forth by the movement is relevant. Man is the traditional defiler of all things and it is true that the major corporate positions in the world and in trade and industrial bodies are filled with men. Therefore, it would be men who constantly attempt to find new ways to exploit powerless nature, which cannot speak aloud. Later arguments of the Ecofeminism are at fault and their views on technology are not acceptable to me. It must be noted that when man does exploit forests and pollutes the waters, the beneficiaries are also women who make up the wives, daughters, sisters, mothers and other relatives of men. By tacitly accepting the cutting down of forests and gathering wood for firewood, women are also equally responsible for this defilement. Ecofeminism concepts also want to do away with technology and move towards primitivism where small communities would grow food in the natural way. This is not possible in the modern age as we need technology to produce food for the billions of people and both men and women have to find jobs and earn a living. So this philosophy is not acceptable. Schlosberg (1999) argues Pluralism or more specifically environmental pluralism places the right to exist for all things in nature, man, animals, plants and other inanimate entities such as water, air and earth that makes the environment. Then comes the concept of cost benefit