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1. Sagging of telephone and electric wires is due to superficial expansion.
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1. Sagging of telephone and electric wires is due to superficial expansion.
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Answer:
To prevent contraction and snapping of the wire during winter.
When a solid gets heat it expands and on cooling it contracts. Due to this electrical and telephone cables are strung out a little loose so that in winter, as cables contract due to cooling of atmosphere and snapping may occur, can be avoided