Give reason of the following
(1) Telephone and electric wires are always kept sagging between pole.
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Answer: Expansion and contraction due to sun and weather.
Explanation: In the winter season wires tends to contract in length because that is the basic property of metal and plastic that in cold weather it shrinks and in hot weather, it expands so to prevent those wires from breaking due to stress they are loosely ties between poles.
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