Question

the telephone wires which sag in summer become straight in winter

Answer 1

when a something is heated it expands and when something is cooled it contracts in the same way telephone wires sag during summer and become straight during winter

Answer 2

Answer:

During summer, the wires heat up and expand in length. Hence it sags down. During winter, the temperature drops and wires cool down. Due to decrease in temperature,it contracts in length and hence becomes straight.

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Explanation: