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Electric wires or telephone wires become tight during winter but sag a little during summer, because they are made of metal which:
  • a)
    Expands on heating
  • b)
    Remains the same on heating
  • c)
    Contracts on heating
  • d)
    Changes shape on heating
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Electric wires or telephone wires become tight during winter but sag a...
Because the cores of overhead wires are made from copper. Metals expand with heat and contract with cold. In winter, the reverse happens - the lines contract and tighten up.
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Electric wires or telephone wires become tight during winter but sag a little during summer, because they are made of metal which:a)Expands on heatingb)Remains the same on heatingc)Contracts on heatingd)Changes shape on heatingCorrect answer is option 'A'. Can you explain this answer?
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