Answer Posted / shahul snfa

normally the transmission lines bend b/w the supports due
to its length and the conductor weight. Because of this
field will be created around the conductor, which ionises
the air around the conductor by which the eneegy is
dissipated as heat(this produces hizzing noise). this makes
the difference between sending end & recieving end voltage.
the amount by which line is bending is proportional to the
losses in the line. that is why the lines have been
tensioned at their supports.

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