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Radio: A Form Of Communication
Beginning of paper
Mr. Zambizi
Physics
Radio is a form of communication in which intelligence is transmitted without
wires from one point to another by means of electromagnetic waves. Early forms
of communication over great distances were the telephone and the telegraph. They
required wires between the sender and receiver. Radio, on the other hand,
requir .... Middle of paper
.... wire that was not physically connected to the first.
Hans Christian Oersted had shown in 1820 that a current flowing in a wire sets
up a magnetic field around the wire. If the current is made to change and, in
particular, made to alternate (flow back and forth), the building up and
collapsing of the associated magnetic field induces a current in another
conductor placed in this changing magnetic field. This principle of
electromagnetic indu ....
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Number of words: 3073
Number of pages: 12 (approx. 250 words per double-spaced page)
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