7. LONG TELEPHONE WIRES SAG DURING SUMMER .WHY ?
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Why do telephone wires sag in summer and become tight during winters. Because the cores of overhead wires are made from copper. ... The higher temperatures in summer make the copper expand - so the lines get slightly longer. In winter, the reverse happens - the lines contract and tighten up.
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connection cut ആയേക്കും.... നമ്മക് ആവശ്യമുള്ളപ്പോൾ ഉപയോഗിക്കാൻ പറ്റില്ല
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