Answer / anil

In overhead cables, we donot require any cooling media as
air is cooling media. whereas in Under ground cables, in
pucca trench, we put sand around the cable before is it is
cemented.The reason for sand is that it absorb water and can
help in transmit the heat from cable.

Answer / k.prakashchandra

Sand remains in the form of loose grains forever,hence
location and removal of cable become easy.Overhead cables
require supporting structures and wires.

n1 =1000 n2 =?;v1 =200:v2 =400

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